Systemic Anatomy Practice Questions

Q: Which one of the following characterizes a portal system of blood vessels?

Two capillary beds connected by a larger blood vessel. ### Explanation **Concept Overview:** In a standard circulatory circuit, blood flows from an artery to a capillary bed and then directly into a vein that returns to the heart. A **portal system** is a specialized vascular arrangement where blood passes through **two capillary beds** in series, connected by a larger "portal" vessel, before returning to the systemic venous circulation. **Why Option C is Correct:** The defining feature of a portal system is the presence of a connecting vessel (vein or artery) between two distinct capillary networks. This allows for the direct transport of specific substances (hormones or nutrients) from one organ to another in high concentrations without being diluted in the general circulation. **Analysis of Incorrect Options:** * **Option A:** Describes an **Arteriovenous (AV) Anastomosis** or shunt, where blood bypasses capillaries entirely [1]. * **Option B:** Describes a general vascular pattern but lacks the "serial" capillary bed requirement that defines a portal system. * **Option D:** Capillary beds are organ-specific and do not physically "extend" as a continuous network across different organs; they are linked by larger conducting vessels [1]. **High-Yield NEET-PG Facts:** There are three primary portal systems in the human body: 1. **Hepatic Portal System (Venous):** Connects the intestinal capillaries to the hepatic sinusoids (second capillary bed). *Function: Nutrient processing and detoxification.* 2. **Hypophyseal Portal System (Venous):** Connects the hypothalamus to the anterior pituitary. *Function: Transport of releasing hormones.* 3. **Renal Portal System (Arterial):** The efferent arteriole connects the glomerular capillaries to the peritubular capillaries/vasa recta. *Note: This is an arterial portal system.*

Q: Which of the following muscles with parallel fibers is the exception?

Tibialis Anterior. **Explanation:** The classification of muscles based on fascicular architecture is a high-yield topic in Anatomy. Muscles are categorized by the arrangement of their fibers relative to the axis of force generation. **Why Tibialis Anterior is the Correct Answer:** The **Tibialis Anterior** is a **circumpennate** (or multipennate) muscle, not a parallel-fibered muscle. In pennate muscles, fibers run obliquely to the tendon, similar to the barbs of a feather. This arrangement allows for a higher density of muscle fibers, prioritizing power over the range of motion. **Analysis of Incorrect Options (Parallel-fibered Muscles):** Parallel muscles have fibers that run parallel to the long axis of the muscle, allowing for a greater range of movement. * **Sartorius:** A classic example of a **strap-like** parallel muscle. It is the longest muscle in the body. * **Rectus Abdominis:** A parallel muscle characterized by **tendinous intersections**, which divide the muscle into segments (the "six-pack" appearance). * **Sternohyoid:** A **strap-like** parallel muscle located in the infrahyoid region of the neck. **NEET-PG High-Yield Pearls:** * **Parallel Muscles:** Best for range of motion (e.g., Sartorius, Gracilis). * **Pennate Muscles:** Best for force/power. * *Unipennate:* Flexor Pollicis Longus. * *Bipennate:* Rectus Femoris. * *Multipennate:* Deltoid (acromial fibers). * *Circumpennate:* Tibialis Anterior. * **Convergent Muscles:** Triangular shape where fibers converge to a single tendon (e.g., Pectoralis Major). * **Cruciate Muscles:** Fibers cross each other (e.g., Masseter, Sternocleidomastoid).

Q: Which of the following statements is NOT TRUE about sesamoid bones?

Found since birth. **Explanation:** Sesamoid bones are specialized small, rounded bones embedded within tendons or joint capsules. The correct answer is **C (Found since birth)** because sesamoid bones are **not** present at birth; they develop through endochondral ossification in response to mechanical stress and friction as a child grows [1]. For example, the patella (the largest sesamoid bone) typically begins to ossify between ages 3 and 6. **Analysis of Options:** * **A. Devoid of periosteum:** This is **true**. Since sesamoid bones are embedded within tendons, they lack a true periosteal covering. Instead, they are covered by the fibers of the tendon or by articular cartilage. * **B. Devoid of Haversian canals:** This is **true**. Unlike long bones, sesamoid bones consist of cortical bone on the periphery and cancellous bone internally, but they lack a formal Haversian system (osteons). * **D. Develops within a tendon:** This is the **defining characteristic** of sesamoid bones [1]. They develop where tendons cross the ends of long bones to protect the tendon from excessive wear and to change the angle of pull (increasing mechanical advantage). **High-Yield Clinical Pearls for NEET-PG:** * **Largest Sesamoid Bone:** Patella (embedded in the Quadriceps tendon). * **Smallest Sesamoid Bone:** Pisiform (embedded in the Flexor Carpi Ulnaris tendon). * **Common Locations:** Head of the first metatarsal (Hallux), head of the first metacarpal (Pollex), and the Fabella (lateral head of Gastrocnemius). * **Function:** They act as "pulleys," reducing friction and altering the direction of muscle pull [1].

Q: All of the following statements are true for the metaphysis of bone except:

It is the strongest part of the bone.. The **metaphysis** is the region of a long bone between the epiphysis and the diaphysis. Understanding its unique structural and vascular properties is crucial for NEET-PG. ### **Explanation of Options** * **Option A (Correct Answer):** The metaphysis is **not** the strongest part of the bone; it is actually structurally weak. It consists of a thin cortex and a lattice of cancellous (spongy) bone [2]. The strongest part of a long bone is the **diaphysis**, which is composed of thick, dense compact bone designed to resist mechanical stress. * **Option B:** This is true. The metaphysis is highly vascular, receiving a rich blood supply from nutrient arteries, periosteal arteries, and metaphyseal arteries [2]. * **Option C:** This is true. The metaphysis is adjacent to the epiphyseal plate (growth plate). It is the site where new bone is deposited (ossification), making it the zone of maximum growth activity [1]. * **Option D:** This is true. In children, the metaphyseal arteries end in **"hairpin loops"** near the growth plate. This leads to sluggish blood flow, which allows bacteria to settle, making it the most common site for **acute hematogenous osteomyelitis**. ### **Clinical Pearls for NEET-PG** * **Osteomyelitis:** In children, infection starts in the metaphysis due to the hairpin loop arrangement. In adults (after growth plate closure), the infection can spread to the epiphysis and joint space. * **Tumors:** Many primary bone tumors (e.g., **Osteosarcoma**, Giant Cell Tumor) preferentially involve the metaphysis because of high cellular turnover and vascularity [3]. * **Fractures:** In children, the metaphysis is prone to "Buckle" or "Torus" fractures due to its porous nature [4].

Q: Which of the following is not a recognised form of epiphysis?

Friction. In anatomy, an **epiphysis** is the end part of a long bone that ossifies from a secondary center [1]. There are four recognized types of epiphyses based on their functional and evolutionary roles. **Friction** is not a recognized type, making it the correct answer. ### Why "Friction" is Correct There is no such anatomical classification as a "friction epiphysis." While friction occurs at joints, it does not dictate the development or classification of ossification centers. ### Explanation of Recognized Epiphyses * **Pressure Epiphysis (Option D):** These are articular and located at the ends of long bones. They transmit the body weight and are subjected to pressure. Examples include the **Head of the femur** and the **Lower end of the radius**. * **Traction Epiphysis (Option A):** These are non-articular and do not take part in weight transmission. They are formed due to the "tug" or pull of tendons/muscles. Examples include the **Greater and Lesser trochanters** of the femur and the **Tubercles of the humerus**. * **Atavistic Epiphysis (Option B):** These represent bones that were independent in lower animals but have become fused to other bones in humans during evolution. Examples include the **Coracoid process** of the scapula and the **Os trigonum** (posterior tubercle of the talus). * **Aberrant Epiphysis:** (Not listed but relevant) These are deviations from the norm, such as an epiphysis at the head of the first metacarpal (usually only at the base). ### NEET-PG High-Yield Pearls * **Pressure epiphyses** ossify earlier than traction epiphyses. * The **Law of Ossification** states that the epiphysis which starts ossifying first is the last to fuse with the shaft (except for the lower end of the fibula). * **Clinical Correlation:** Osgood-Schlatter disease involves the traction epiphysis of the tibial tuberosity.

Q: Which of the following is a traction epiphysis?

Lesser tubercle of humerus. **Explanation:** In anatomy, epiphyses are classified based on their developmental characteristics. A **traction epiphysis** is a non-articular part of a bone that develops under the influence of the pull (traction) of attached tendons or muscles [1]. It does not contribute to the length of the bone but serves as a site for muscle attachment. **1. Why Option B is Correct:** The **Lesser tubercle of the humerus** is a classic example of a traction epiphysis. It develops due to the traction exerted by the **subscapularis muscle**. Other common examples include the greater tubercle of the humerus, the trochanters of the femur, and the mastoid process. **2. Analysis of Incorrect Options:** * **A. Head of humerus:** This is a **pressure epiphysis**. Pressure epiphyses are articular, located at the ends of long bones, and transmit the weight of the body. They are responsible for the longitudinal growth of the bone [1]. * **C. Deltoid tuberosity:** This is not an epiphysis at all; it is a **diaphyseal modification** (an outgrowth on the shaft of the bone). * **D. Coracoid process:** This is an example of an **atavistic epiphysis**. These represent bones that were phylogenetically independent in lower animals but have become fused to another bone in humans. **High-Yield Clinical Pearls for NEET-PG:** * **Pressure Epiphysis:** Articular, transmits weight (e.g., Head of femur, Lower end of radius). * **Traction Epiphysis:** Non-articular, site of muscle attachment (e.g., Tubercles, Trochanters). * **Atavistic Epiphysis:** Phylogenetically independent (e.g., Coracoid process of scapula, Os trigonum). * **Aberrant Epiphysis:** Not always present (e.g., Epiphysis at the head of the 1st metacarpal or base of other metacarpals).

Q: Lymphatics are found in:

Dermis of skin. The lymphatic system is responsible for draining interstitial fluid, proteins, and antigens from tissues. However, lymphatics are not distributed uniformly throughout the body. **Why Dermis of Skin is Correct:** The skin is a primary immunological barrier. The **dermis** contains a rich network of lymphatic capillaries (initial lymphatics) that drain into the superficial and deep plexuses [2]. These are essential for maintaining fluid balance and transporting immune cells (like Langerhans cells) to regional lymph nodes. **Why Other Options are Incorrect:** * **Brain (A):** The Central Nervous System (CNS) lacks traditional lymphatic vessels [1]. Instead, it utilizes the **"Glymphatic system"** (glial-associated lymphatic system), where cerebrospinal fluid (CSF) interchanges with interstitial fluid via perivascular spaces. * **Choroid (B):** The eyeball (specifically the retina, cornea, and choroid) is devoid of lymphatics [1]. Fluid drainage in the eye is primarily managed by the aqueous humor pathways. * **Internal Ear (C):** Similar to the CNS, the internal ear is a specialized sensory organ that lacks a lymphatic capillary network. **High-Yield NEET-PG Pearls:** * **Avascular/Lymph-free zones:** Lymphatics are notably **absent** in the CNS, eyeball, internal ear, hyaline cartilage, epidermis, splenic pulp, and bone marrow [1]. * **Placenta:** The placenta also lacks lymphatic vessels. * **Largest Lymphatic Vessel:** The Thoracic Duct (drains 3/4ths of the body) [1]. * **Clinical Correlation:** Obstruction of dermal lymphatics (e.g., by filarial worms or malignancy) leads to **Lymphedema**, classically presenting as non-pitting edema or "Peau d'orange" appearance in breast cancer.

Q: Which of the following joints does not have a fibrocartilaginous intra-articular disc?

Shoulder joint. ### Explanation The presence of a **fibrocartilaginous intra-articular disc** (or meniscus) is a characteristic feature of certain synovial joints. These discs serve to increase joint stability, absorb shock, and allow for complex movements by dividing the joint cavity into compartments. **Why the Shoulder Joint is the Correct Answer:** The **Shoulder (Glenohumeral) joint** does not contain an intra-articular disc. Instead, it features a **Glenoid Labrum**, which is a fibrocartilaginous rim that deepens the shallow glenoid cavity to accommodate the humeral head. While both are fibrocartilage, a labrum is a peripheral ring, whereas a disc is a structure that spans the joint space. **Analysis of Incorrect Options:** * **Temporomandibular Joint (TMJ):** Contains a complete fibrocartilaginous disc that divides the joint into upper (meniscotemporal) and lower (meniscomandibular) compartments, facilitating gliding and hinge movements respectively. * **Sternoclavicular Joint:** Contains a complete articular disc that compensates for the incongruity between the clavicle and the manubrium, acting as a vital shock absorber during overhead lifting. * **Inferior Radioulnar Joint:** Contains a triangular fibrocartilage disc (part of the **TFCC** - Triangular Fibrocartilage Complex) that separates the distal ulna from the carpal bones. **High-Yield NEET-PG Pearls:** 1. **Memory Aid:** Joints with discs/menisci include the TMJ, Sternoclavicular, Acromioclavicular, Inferior Radioulnar, and Knee joints. 2. **Histology Note:** Most articular surfaces are covered by hyaline cartilage; however, the **TMJ** and **Sternoclavicular** joints are unique because their surfaces are covered by **fibrocartilage**. 3. **Clinical Fact:** The disc of the Sternoclavicular joint is the only structure preventing the medial end of the clavicle from being driven upwards and inwards during trauma.

Q: Which of the following is an example of a sesamoid bone?

Pisiform in flexor carpi ulnaris. **Explanation:** **Sesamoid bones** are unique ossicles embedded within tendons or joint capsules [1]. They lack a periosteum and function primarily to reduce friction, modify pressure, and alter the direction of muscle pull, acting as anatomical pulleys. **Why Option B is Correct:** The **Pisiform** is a classic example of a sesamoid bone. It develops within the tendon of the **Flexor Carpi Ulnaris (FCU)** muscle. It is unique because it is the only carpal bone that is also a sesamoid bone, articulating only with the triquetral bone. **Analysis of Incorrect Options:** * **Option A:** **Rider’s bone** is an example of **heterotopic (ectopic) ossification**. It occurs due to chronic trauma and calcification within the tendon of the **adductor longus** (not magnus) in horseback riders. It is a pathological calcification, not a true physiological sesamoid bone. * **Option C:** The **Fabella** is indeed a sesamoid bone, but it is located in the **lateral head** of the gastrocnemius, not the medial head. This makes the option factually incorrect. * **Option D:** The sesamoid bone in the foot is found within the tendon of the **Peroneus Longus** (as it crosses the cuboid), not the "peronius teius" (which is not a standard anatomical term). **High-Yield NEET-PG Pearls:** 1. **Patella:** The largest sesamoid bone in the body (embedded in the Quadriceps femoris tendon). 2. **Ossification:** Sesamoid bones typically ossify after birth [1]. 3. **Other Examples:** Two sesamoids are consistently found under the head of the **1st metatarsal** (in the Flexor hallucis brevis tendon). 4. **Clinical Significance:** Inflammation of these bones (Sesamoiditis) is a common cause of forefoot pain in athletes.

Q: Which of the following is an example of an ellipsoid joint?

Wrist. Explanation: The **Wrist joint (Radiocarpal joint)** is a classic example of an **ellipsoid (condyloid) joint**. In this type of synovial joint, an oval-shaped convex surface (the distal end of the radius and the articular disc) fits into an elliptical concave cavity (formed by the scaphoid, lunate, and triquetrum). This configuration allows for movement in two planes (biaxial): flexion/extension and abduction/adduction (radial/ulnar deviation), along with circumduction, but prohibits axial rotation. **Analysis of Incorrect Options:** * **B. Knee Joint:** This is a **complex synovial joint**, primarily classified as a **modified hinge joint** (or bicondylar joint). It allows flexion and extension, with some degree of medial and lateral rotation when the knee is flexed. * **C. Ankle Joint:** This is a **hinge joint** (ginglymus) formed by the tibia, fibula, and talus. It primarily permits uniaxial movement: dorsiflexion and plantarflexion. * **D. Shoulder Joint:** This is a **ball-and-socket joint** (spheroidal). It is multiaxial, allowing the greatest range of motion in the body, including rotation. **NEET-PG High-Yield Pearls:** * **Other Ellipsoid Joints:** Metacarpophalangeal (MCP) joints and the Atlanto-occipital joint (the "Yes" joint). * **Saddle Joint (Sellar):** Frequently tested; the prime example is the **1st Carpometacarpal joint** (base of the thumb). * **Pivot Joint (Trochoid):** Examples include the Atlanto-axial joint (the "No" joint) and the Superior Radioulnar joint. * **Note:** The wrist joint proper does *not* include the ulna; the ulna is separated from the carpal bones by an articular disc.

Question 1

Which one of the following characterizes a portal system of blood vessels?

Accepted Answer

Two capillary beds connected by a larger blood vessel

Answer

The absence of a capillary bed, thus shunting arterial blood directly to venules

Answer

A capillary bed supplied and drained by a larger, non-capillary vessel

Answer

A continuous capillary bed that extends from one organ to another

Question 2

Which of the following muscles with parallel fibers is the exception?

Accepted Answer

Tibialis Anterior

Answer

Sartorius

Answer

Rectus Abdominis

Answer

Sternohyoid

Question 3

Which of the following statements is NOT TRUE about sesamoid bones?

Accepted Answer

Found since birth

Answer

Devoid of periosteum

Answer

Devoid of Haversian canals

Answer

Develops within a tendon

Question 4

All of the following statements are true for the metaphysis of bone except:

Accepted Answer

It is the strongest part of the bone.

Answer

It is the most vascular part of the bone.

Answer

Growth activity is maximized here.

Answer

It is the region during hematogenous spread of infection.

Question 5

Which of the following is not a recognised form of epiphysis?

Accepted Answer

Friction

Answer

Traction

Answer

Atavistic

Answer

Pressure

Question 6

Which of the following is a traction epiphysis?

Accepted Answer

Lesser tubercle of humerus

Answer

Head of humerus

Answer

Deltoid tuberosity

Answer

Coracoid process

Question 7

Lymphatics are found in:

Accepted Answer

Dermis of skin

Answer

Brain

Answer

Choroid

Answer

Internal ear

Question 8

Which of the following joints does not have a fibrocartilaginous intra-articular disc?

Accepted Answer

Shoulder joint

Answer

Temporomandibular joint

Answer

Sternoclavicular joint

Answer

Inferior radioulnar joint

Question 9

Which of the following is an example of a sesamoid bone?

Accepted Answer

Pisiform in flexor carpi ulnaris

Answer

Rider's bone in adductor magnus

Answer

Fabella in medial head of gastrocnemius

Answer

One bone in peronius teius

Question 10

Which of the following is an example of an ellipsoid joint?

Accepted Answer

Wrist

Answer

Knee

Answer

Ankle

Answer

Shoulder

Systemic Anatomy — MCQs

Systemic Anatomy — MCQs

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