Systemic Anatomy Practice Questions

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

Growth activity is negligible here.. The **metaphysis** is the region of a long bone between the epiphysis and the diaphysis. It is one of the most clinically significant areas in pediatric orthopedics. ### **Explanation of Options** * **Option C (Correct):** This statement is false. The metaphysis is the **zone of active growth**. It contains the epiphyseal plate (growth plate) where chondrocyte proliferation and ossification occur [1]. Therefore, growth activity is **maximal**, not negligible. * **Option A:** This is true. Anatomically, the metaphysis is the expanded end of the diaphysis that abuts the epiphyseal cartilage. * **Option B:** This is true. The metaphysis receives a profuse blood supply from nutrient arteries and periosteal vessels, forming a rich vascular plexus to support rapid bone formation. * **Option C:** This is true. In children, the metaphyseal arteries end in **"hairpin loops"** near the growth plate. These loops cause sluggish blood flow, allowing bacteria to settle, making it the most common site for **acute hematogenous osteomyelitis**. ### **High-Yield NEET-PG Pearls** 1. **Vascularity:** After the epiphyseal plate fuses (adulthood), the vascular communication between the metaphysis and epiphysis is established. 2. **Tumors:** The metaphysis is the "favorite" site for many bone tumors, most notably **Osteosarcoma** [2], **Osteochondroma**, and **Giant Cell Tumor** (which starts in the metaphysis but often involves the epiphysis) [1]. 3. **Healing:** Due to its high vascularity and presence of osteogenic cells, fractures in the metaphyseal region generally heal faster than those in the diaphyseal region.

Q: Which of the following is an example of a saddle joint?

Carpo-metacarpal joint of the thumb. ### Explanation **Correct Answer: A & B (Carpo-metacarpal joint of the thumb)** A **Saddle (Sellar) joint** is a type of synovial joint where the opposing surfaces are reciprocally concavo-convex (shaped like a rider sitting on a saddle). This unique geometry allows for movement in two primary planes (biaxial)—flexion/extension and abduction/adduction—while also permitting **circumduction** and the critical movement of **opposition**. The 1st Carpo-metacarpal (CMC) joint, between the trapezium and the base of the first metacarpal, is the classic anatomical example of this joint type. **Analysis of Incorrect Options:** * **Ankle Joint (C):** This is a **Hinge (Ginglymus)** joint. It primarily allows movement in one plane (dorsiflexion and plantarflexion) between the talus and the mortise formed by the tibia and fibula. * **Knee Joint (D):** This is classified as a **Modified Hinge** joint (or complex bicondylar joint). While it primarily performs flexion and extension, it also allows for a small degree of medial and lateral rotation (the "locking" mechanism), distinguishing it from a pure hinge or saddle joint. **High-Yield Clinical Pearls for NEET-PG:** * **Other Saddle Joints:** Sternoclavicular joint, Incudomalleolar joint (in the middle ear), and the Calcaneocuboid joint. * **The Thumb CMC Joint:** It is the most common site for osteoarthritis in the hand due to the high mechanical stress placed on its unique saddle-shaped surfaces [1]. * **Movement Note:** Although saddle joints are biaxial, the 1st CMC joint allows for "conjunct rotation," which is essential for the opposition of the thumb against other fingers.

Q: All of the following are fibrous joints except?

Temporomandibular joint (TMJ). ### Explanation The classification of joints is based on the type of connective tissue that binds the bones together. This question tests your ability to distinguish between **fibrous joints** and **synovial joints**. **Why Option A is Correct:** The **Temporomandibular Joint (TMJ)** is a **synovial joint** (specifically a bicondylar variety) [1]. Unlike fibrous joints, it features a joint cavity, a synovial membrane, and a fibrous capsule [1]. A unique high-yield feature of the TMJ is that its articular surfaces are covered by **fibrocartilage** rather than the typical hyaline cartilage, and it contains an intra-articular disc that divides the joint into two separate compartments. **Why the Other Options are Incorrect:** Fibrous joints are characterized by bones held together by dense fibrous connective tissue with no joint cavity. They include: * **B. Suture:** Found exclusively in the skull (e.g., sagittal suture). These are immovable (synarthroses). * **C. Gomphosis:** A specialized "peg-and-socket" fibrous joint, specifically the articulation of teeth within the alveolar processes of the mandible and maxilla. * **D. Syndesmosis:** A joint where bones are joined by an interosseous membrane or ligament (e.g., the inferior tibiofibular joint). These allow for slight movement. **High-Yield Clinical Pearls for NEET-PG:** * **Schindylesis:** A rare type of fibrous joint where a ridge of one bone fits into a groove of another (e.g., between the vomer and the rostrum of the sphenoid). * **Primary Cartilaginous (Synchondrosis):** Joined by hyaline cartilage; usually temporary (e.g., epiphyseal plate). * **Secondary Cartilaginous (Symphysis):** Joined by fibrocartilage; always occurs in the midline (e.g., Pubic symphysis, Manubriosternal joint). * **TMJ Development:** It is the only synovial joint in the body where the articular surfaces are not covered by hyaline cartilage.

Q: All of the following organs have no lymphatic capillaries EXCEPT:

Liver. The lymphatic system is responsible for draining interstitial fluid from tissues. However, certain specialized tissues in the body are "lymph-free" and lack traditional lymphatic capillaries. [1] **1. Why Liver is the Correct Answer:** The liver is one of the most lymph-productive organs in the body, producing nearly **25% to 50% of the total lymph** that enters the thoracic duct. While the hepatic parenchyma contains unique leaky capillaries called sinusoids, the lymphatic capillaries are located in the **Space of Mall** (a space between the portal tract and the hepatocytes). [2] This lymph eventually drains into the hepatic lymph nodes. **2. Why the Other Options are Incorrect:** * **Brain and Spinal Cord (CNS):** The Central Nervous System (CNS) is traditionally considered to lack conventional lymphatic vessels. [1] Instead, it utilizes the **Glymphatic system** (a perivascular pathway involving astrocytes) and the cerebrospinal fluid (CSF) for waste clearance. * **Eyeball:** Most structures of the eyeball, including the cornea, lens, and vitreous humor, are devoid of lymphatic vessels to maintain optical clarity and immune privilege. [1] (Note: The conjunctiva does have lymphatics, but the internal eyeball does not). **3. High-Yield Facts for NEET-PG:** * **List of Lymph-free areas:** CNS (Brain/Spinal cord), Eyeball, Internal Ear, Epidermis, Cartilage, Bone marrow, and Splenic pulp. [1] * **The Liver Exception:** Despite having sinusoids instead of typical capillaries, the liver is a "lymph-generating powerhouse." * **Placenta:** The placenta is another notable organ that lacks lymphatic vessels. * **Cornea:** It is famously avascular and alymphatic, which is why corneal transplants have a high success rate (low risk of immune rejection). [1]

Q: Identify the type of joint shown in the image.

Plane synovial joint. ***Plane synovial joint*** - Features **flat articular surfaces** that allow **gliding and sliding movements** between bones with minimal angular motion. - Examples include **intercarpal joints**, **intertarsal joints**, and **acromioclavicular joint** where bones slide over each other. *Fibrous joint* - Characterized by **fibrous connective tissue** directly connecting bones with **no synovial cavity**. - Allows **little to no movement** (synarthroses) such as **sutures** in the skull or **syndesmoses** like distal tibiofibular joint. *Condylar joint* - Features **oval-shaped condyle** fitting into **elliptical cavity** allowing **biaxial movement** (flexion-extension, abduction-adduction). - Examples include **metacarpophalangeal joints** and **radiocarpal joint** with distinct rounded articular surfaces. *Saddle joint* - Has **reciprocally curved surfaces** resembling a **rider on a saddle** allowing **biaxial movement** with opposition. - The classic example is the **carpometacarpal joint of the thumb** enabling **opposition** and **circumduction** movements.

Q: Which of the following is NOT a spiral muscle?

Sternocleidomastoid. The concept of **spiral muscles** refers to muscles whose fibers undergo a twist or rotation between their origin and insertion. This structural arrangement allows for a greater range of motion and increased power during contraction. **1. Why Sternocleidomastoid is the Correct Answer:** The **Sternocleidomastoid (SCM)** is a **parallel-fibered muscle**. Its fibers run straight from the manubrium sterni and clavicle to the mastoid process without any twisting or spiraling. While it acts as a primary rotator of the head, its anatomical fiber orientation is linear, not spiral. **2. Analysis of Incorrect Options (Spiral Muscles):** * **Supinator:** This is a classic example of a spiral muscle. It arises from the lateral epicondyle and supinator crest and wraps spirally around the upper part of the radius to insert on its lateral surface. * **Pectoralis Major:** This is a **cruciate (spiral) muscle**. The fibers of the lower (sternocostal) head twist behind the upper (clavicular) head to insert into the lateral lip of the bicipital groove, resulting in a 180-degree twist. * **Trapezius:** The lower fibers of the trapezius spiral upwards and laterally to reach the tubercle of the scapular spine, making it a spiral muscle. **3. NEET-PG High-Yield Pearls:** * **Other Spiral Muscles:** Latissimus dorsi (twists around the teres major) and Tibialis anterior. * **Functional Significance:** Spiraling allows a muscle to exert force in multiple planes and prevents the muscle from becoming "slack" during complex joint movements. * **Pectoralis Major Clinical:** The twisting of the pectoralis major forms the rounded **anterior axillary fold**. Loss of this fold is a clinical sign of pectoralis major rupture or congenital absence (Poland Syndrome).

Q: Which of the following is a traction epiphysis?

Greater trochanter of femur. ### Explanation **Concept of Epiphyses** In anatomy, epiphyses are classified into four types 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 powerful muscles or tendons [1]. These epiphyses do not take part in the formation of a joint. **Why the Correct Answer is Right:** * **Greater trochanter of femur:** This is a classic example of a traction epiphysis. It develops due to the pull of the gluteal muscles (Gluteus medius and minimus). Similarly, the **lesser trochanter** (psoas major) and the **medial and lateral epicondyles of the humerus** are also traction epiphyses. **Analysis of Incorrect Options:** * **Head of humerus (Option A):** This is a **pressure epiphysis**. Pressure epiphyses are articular, located at the ends of long bones, and transmit the weight of the body (e.g., head of femur, lower end of radius) [1]. * **Coracoid process of scapula (Option B):** This is an **atavistic epiphysis**. These represent bones that were phylogenetically independent in lower animals but have become fused to other bones in humans. Another example is the os trigonum of the talus. * **Head of 1st metacarpal (Option C):** This is an **aberrant epiphysis**. These are epiphyses that are not always present or appear at ends of bones where they are not normally expected (e.g., epiphysis at the head of the 1st metacarpal instead of the base). **High-Yield NEET-PG Pearls:** 1. **Pressure Epiphysis:** Articular; transmits weight (e.g., Head of Femur). 2. **Traction Epiphysis:** Non-articular; site of muscle attachment (e.g., Trochanters, Tubercles, Epicondyles). 3. **Atavistic Epiphysis:** Phylogenetically independent (e.g., Coracoid process, Os trigonum). 4. **Aberrant Epiphysis:** Deviates from normal pattern (e.g., Base of 2nd metacarpal).

Q: Which of the following is a discrete muscle of the Panniculus carnosus?

Dartos. The **Panniculus carnosus** is a layer of striated muscle found within the subcutaneous tissue (superficial fascia). While extensively developed in lower mammals (allowing animals like horses to twitch their skin to repel insects), it is largely vestigial in humans. **Why Dartos is the Correct Answer:** The **Dartos muscle** of the scrotum is a classic example of a discrete remnant of the panniculus carnosus in humans. It is a layer of smooth muscle fibers located within the superficial fascia of the scrotum. Unlike most skeletal muscles, it lacks bony attachments and acts directly on the skin to regulate the surface area of the scrotum for thermoregulation. **Analysis of Incorrect Options:** * **Temporoparietalis & Occipitalis:** These are components of the *Epicranius* (Scalp) complex. While the muscles of facial expression are technically derived from the panniculus carnosus, they are categorized as specialized muscles of the second pharyngeal arch. In the context of "discrete remnants" usually tested in exams, the Dartos is the preferred answer. * **Cremasteric Muscle:** This is **not** a derivative of the panniculus carnosus. It is a skeletal muscle derived from the **Internal Oblique muscle** (investing fascia of the abdominal wall) and is responsible for the cremasteric reflex. **High-Yield Clinical Pearls for NEET-PG:** * **Other Remnants:** Other human remnants of the panniculus carnosus include the **Platysma** (neck), **Palmaris brevis** (hand), and the muscles of the face/scalp. * **Function of Dartos:** It is responsible for the "wrinkling" of scrotal skin. It is innervated by **sympathetic nerve fibers** (unlike the Cremaster, which is supplied by the genital branch of the genitofemoral nerve). * **Histology Note:** While the ancestral panniculus carnosus is striated (skeletal) muscle, the human Dartos is composed of **smooth muscle**.

Question 1

All of the following statements are true for the metaphysis of a bone except?

Accepted Answer

Growth activity is negligible here.

Answer

It is the epiphyseal end of the diaphysis.

Answer

It is highly vascular.

Answer

It is a common site of osteomyelitis in children.

Question 2

Which of the following is an example of a saddle joint?

Accepted Answer

Carpo-metacarpal joint of the thumb

Answer

Ankle joint

Answer

Knee joint

Question 3

All of the following are fibrous joints except?

Accepted Answer

Temporomandibular joint (TMJ)

Answer

Suture

Answer

Gomphosis

Answer

Syndesmosis

Question 4

Good collateral circulation occurs in which of the following structures?

Accepted Answer

Skin

Answer

Muscle

Answer

Fascia

Answer

Bone

Question 5

All of the following organs have no lymphatic capillaries EXCEPT:

Accepted Answer

Liver

Answer

Eyeball

Answer

Spinal cord

Answer

Brain

Question 6

Identify the type of joint shown in the image.

Accepted Answer

Plane synovial joint

Answer

Fibrous joint

Answer

Condylar joint

Answer

Saddle joint

Question 7

Which of the following is NOT a spiral muscle?

Accepted Answer

Sternocleidomastoid

Answer

Supinator

Answer

Pectoralis major

Answer

Trapezius

Question 8

Which artery supplies the growth plate of a long bone?

Accepted Answer

Epiphyseal artery

Answer

Metaphyseal artery

Answer

Nutrient artery

Answer

Periosteal artery

Question 9

Which of the following is a traction epiphysis?

Accepted Answer

Greater trochanter of femur

Answer

Head of humerus

Answer

Coracoid process of scapula

Answer

Head of 1st metacarpal

Question 10

Which of the following is a discrete muscle of the Panniculus carnosus?

Accepted Answer

Dartos

Answer

Temporoparietalis

Answer

Occipitalis

Answer

Cremasteric

Systemic Anatomy — MCQs

Systemic Anatomy — MCQs

On this page

Practice by Chapter

Want unlimited practice?