Systemic Anatomy — MCQs
On this page
Which anatomical plane passes through the midpoint between the suprasternal notch and the pubic symphyses?
Which of the following is a traction epiphysis?
What type of muscles are medial two lumbricals?
Which muscle attaches to the posterior surface of the sacrum?
Long spinous processes are characteristically seen in?
Pyriform fossa is situated in?
Ostmann fat pad is related to?
What is the term for the pathways followed by corrosive acids in the stomach?
What is the length of the Eustachian tube?
Where is the scutum located in the middle ear?
Systemic Anatomy Indian Medical PG Practice Questions and MCQs
Question 211: Which anatomical plane passes through the midpoint between the suprasternal notch and the pubic symphyses?
- A. Subcostal plane
- B. Transpyloric plane (Correct Answer)
- C. Transtubercular plane
- D. Transxiphoid plane
Explanation: ***Transpyloric plane*** - The **transpyloric plane** is a commonly used anatomical landmark that is positioned approximately halfway between the **suprasternal notch** (at the top of the sternum) and the **pubic symphysis** (where the pubic bones meet). - This plane typically passes through the **pylorus of the stomach**, the neck of the pancreas, the hila of the kidneys, the fundus of the gallbladder, and the origin of the superior mesenteric artery. - It is located at approximately the level of the **L1 vertebra**. *Transtubercular plane* - The **transtubercular plane** passes through the **iliac tubercles** of the pelvis. - This plane is located at the level of **L5 vertebra**, much lower than the midpoint between the suprasternal notch and the pubic symphysis. *Subcostal plane* - The **subcostal plane** passes through the **lower borders of the 10th costal cartilages**. - This plane is located at the level of **L3 vertebra**, lower than the transpyloric plane. *Transxiphoid plane* - The **transxiphoid plane** passes through the **xiphoid process** of the sternum. - This plane is located at approximately the **T9 vertebra level**, significantly higher than the midpoint between the suprasternal notch and the pubic symphysis.
Question 212: Which of the following is a traction epiphysis?
- A. Tibial Condyles
- B. Coracoid Process (Correct Answer)
- C. Distal Radius
- D. Mastoid process
Explanation: ***Coracoid Process*** - A **traction epiphysis** is an apophysis that forms due to the pull of muscles and ligaments. The **coracoid process** serves as an attachment site for multiple muscles and ligaments, including the pectoralis minor, coracobrachialis, and biceps brachii (short head), as well as the coracoclavicular ligaments. - The continuous **tractional forces** from these soft tissue attachments stimulate the growth and ossification of the coracoid process, making it a **classic textbook example** of a traction epiphysis. - It is one of the **most commonly cited examples** in anatomy education for this concept. *Distal Radius* - The distal radius is a **pressure epiphysis**, primarily involved in forming the **wrist joint** and transmitting compressive forces from the hand to the forearm. - Its growth is mainly influenced by weight-bearing and articular cartilage rather than muscular or ligamentous traction. *Tibial Condyles* - The tibial condyles are part of the **proximal growth plate of the tibia**, acting as a **pressure epiphysis** that contributes significantly to the length of the tibia and forms the knee joint. - They primarily bear the compressive forces of the body weight across the knee joint and are not primarily shaped by muscle or ligamentous traction. *Mastoid Process* - The mastoid process is also an **apophysis** that develops in response to the pull of the **sternocleidomastoid muscle**. - While it does develop due to traction, the **coracoid process** is the more **standard textbook example** when teaching the concept of traction epiphysis due to its multiple muscle attachments and prominence in anatomy curricula.
Question 213: What type of muscles are medial two lumbricals?
- A. Multipennate
- B. Bipennate (Correct Answer)
- C. None of the options
- D. Unipennate
Explanation: ***Bipennate*** - The **medial two lumbricals** (third and fourth) are classified as **bipennate muscles** because they originate from two adjacent tendons of the flexor digitorum profundus (FDP). - Each of these lumbricals arises from the **adjacent sides of two FDP tendons**, with muscle fibers converging toward a central insertion, creating a bipennate arrangement. - This dual origin distinguishes them from the lateral two lumbricals, which are unipennate. *Unipennate* - **Unipennate muscles** have fibers that attach obliquely to only one side of a single tendon. - The **lateral two lumbricals** (first and second) are unipennate as they each arise from a single FDP tendon. - This is not the correct classification for the medial two lumbricals. *Multipennate* - **Multipennate muscles** have multiple tendon arrangements with fibers converging at different angles from several directions. - Examples include the **deltoid muscle**, which has a much more complex architecture than lumbricals. *None of the options* - Since **bipennate** accurately describes the structure of the medial two lumbricals based on their dual tendon origins, this option is incorrect. - The architectural classification is well-established in anatomical literature.
Question 214: Which muscle attaches to the posterior surface of the sacrum?
- A. Multifidus Lumborum (Correct Answer)
- B. Iliacus
- C. Coccygeus
- D. Piriformis
Explanation: ***Multifidus Lumborum*** - The **multifidus lumborum** is a deep back muscle that has attachments to the **posterior surface of the sacrum**, specifically the sacral groove. - Its primary role involves **stabilizing the spine** and performing small, precise movements of the vertebrae. *Iliacus* - The **iliacus muscle** originates from the **iliac fossa** of the pelvic bone, not the sacrum. - It primarily acts as a **hip flexor** by inserting onto the lesser trochanter of the femur. *Coccygeus* - The **coccygeus muscle** (also known as ischiococcygeus) originates from the **ischial spine** and inserts onto the lateral border of the coccyx and the lowest part of the sacrum, but its primary attachment is not the posterior surface of the sacrum. - It forms part of the **pelvic floor**, supporting pelvic organs and flexing the coccyx. *Piriformis* - The **piriformis muscle** originates from the **anterior surface of the sacrum**, specifically the pelvic surface, and runs through the greater sciatic notch. - It is a **hip external rotator** and abductor, inserting onto the greater trochanter of the femur.
Question 215: Long spinous processes are characteristically seen in?
- A. Cervical vertebrae
- B. Thoracic Vertebrae (Correct Answer)
- C. Lumbar Vertebrae
- D. Sacrum
Explanation: ***Thoracic Vertebrae*** - Thoracic vertebrae are characterized by their **long, slender, and downward-sloping spinous processes**, which overlap the vertebra below. - This anatomical feature provides protection to the spinal cord and limits hyperextension of the thoracic spine. *Cervical vertebrae* - Most cervical vertebrae (C3-C6) have **short, bifid spinous processes**. - The spinous process of **C7 is typically long and non-bifid**, often referred to as the vertebra prominens. *Lumbar Vertebrae* - Lumbar vertebrae have **short, thick, and horizontally oriented spinous processes**, which are quadrilateral in shape. - These spinous processes are designed to provide attachment for large back muscles and allow for significant flexion and extension of the lower back. *Sacrum* - The sacrum is a **fusion of five sacral vertebrae** and does not have individual distinct long spinous processes. - Instead, the fused spinous processes form the **median crest** on its posterior surface.
Question 216: Pyriform fossa is situated in?
- A. None of the options
- B. Oropharynx
- C. Hypopharynx (Correct Answer)
- D. Nasopharynx
Explanation: ***Hypopharynx*** - The **pyriform fossa** (also known as the pyriform sinus) is a depression located on either side of the **laryngeal inlet** within the hypopharynx [1]. - It serves as a channel for food and liquid during swallowing, directing them away from the airway [1]. *Oropharynx* - The oropharynx extends from the soft palate to the epiglottis, whereas the pyriform fossa is located inferior to the epiglottis. - Key structures in the oropharynx include the palatine tonsils and the base of the tongue. *Nasopharynx* - The nasopharynx is the uppermost part of the pharynx, located behind the nasal cavity and above the soft palate. - It primarily functions in respiration and contains the adenoids and opening of the Eustachian tubes. *None of the options* - This option is incorrect because the pyriform fossa is definitively located within the hypopharynx [1].
Question 217: Ostmann fat pad is related to?
- A. Ear lobule
- B. Buccal mucosa
- C. Tip of nose
- D. Eustachian tube (Correct Answer)
Explanation: ***Eustachian tube*** - The **Ostmann fat pad** (also known as the **corpus adiposum tubae auditivae**) is a collection of adipose tissue located at the lateral end of the Eustachian tube. - It is believed to play a role in the function of the **Eustachian tube**, potentially aiding in its opening and closing mechanisms. *Ear lobule* - The **ear lobule** is composed of fibrous and fatty tissue but does not contain a specific structure known as the Ostmann fat pad. - Its primary function is aesthetic and for attachment of earrings, with no direct connection to the Eustachian tube. *Buccal mucosa* - The **buccal mucosa** lines the inside of the cheeks and is primarily composed of stratified squamous epithelium. - It does not contain the Ostmann fat pad, which is distinct to the region around the Eustachian tube. *Tip of nose* - The **tip of the nose** is primarily composed of cartilage, soft tissue, and skin. - There is no anatomical structure within the nose referred to as the Ostmann fat pad.
Question 218: What is the term for the pathways followed by corrosive acids in the stomach?
- A. Type of ulcer associated with burns
- B. Magenstrasse (Correct Answer)
- C. No relevant pathway
- D. Type of ulcer associated with head trauma
Explanation: ***Magenstrasse (Correct Answer)*** - This term refers to the specialized **longitudinal folds or grooves along the lesser curvature of the stomach** that facilitate the rapid passage of liquids from the esophagus directly to the pylorus, bypassing the fundus and body. - In **forensic pathology**, when corrosive substances (acids or alkalis) are ingested, they characteristically follow these gastric rugal folds, creating **linear burn patterns** along the Magenstrasse. - This is a key concept in toxicology related to corrosive substance ingestion and helps explain the pattern of gastric injury seen in such cases. *Type of ulcer associated with burns (Incorrect)* - This describes a **Curling's ulcer**, which is an acute peptic ulcer of the duodenum or stomach that can develop after severe burns due to physiological stress and reduced blood flow to the gastric mucosa. - While it involves the stomach, it does not describe the specific anatomical pathways corrosive agents take but rather a *type* of pathology resulting from thermal injury and stress response. *No relevant pathway (Incorrect)* - This is incorrect because specific pathways like the **Magenstrasse** do exist and are well-documented in anatomy and forensic pathology. - These pathways are clinically relevant for understanding how corrosive substances cause localized linear damage patterns in the stomach. *Type of ulcer associated with head trauma (Incorrect)* - This describes a **Cushing's ulcer**, which is an acute gastric or duodenal ulcer that can occur in patients with head injuries or intracranial pathology. - The pathophysiology involves increased intracranial pressure leading to increased vagal stimulation and gastric acid secretion, which is distinct from the physical anatomical pathways that corrosive agents follow.
Question 219: What is the length of the Eustachian tube?
- A. 12 mm
- B. 24 mm
- C. 48 mm
- D. 36 mm (Correct Answer)
Explanation: ***36 mm*** - The Eustachian tube, also known as the **pharyngotympanic tube** or **auditory tube**, measures approximately **36 mm** in length in adults. - This length allows it to connect the **middle ear** to the **nasopharynx**, facilitating pressure equalization and fluid drainage [1]. *12 mm* - This measurement is significantly **shorter** than the anatomical length of the Eustachian tube. - A tube of this length would not effectively connect the middle ear to the nasopharynx to perform its functions. *24 mm* - This length is still **shorter** than the typical adult Eustachian tube. - While closer than 12 mm, it does not represent the average anatomical length. *48 mm* - This measurement is **longer** than the average adult Eustachian tube. - An Eustachian tube of this length would be uncharacteristically long and not anatomically typical.
Question 220: Where is the scutum located in the middle ear?
- A. Roof
- B. Lateral wall (Correct Answer)
- C. Medial wall
- D. Floor
Explanation: ***Lateral wall*** - The **scutum** is a bony spur located on the **lateral wall** of the epitympanum (attic), which is the superior-most portion of the middle ear space. - It forms part of the **outer bony rim** of the tympanic annulus, bordering the superior aspect of the tympanic membrane. *Roof* - The roof of the middle ear, known as the **tegmen tympani**, is a thin plate of bone separating the middle ear from the middle cranial fossa. - This structure primarily protects the brain and does not contain the scutum. *Medial wall* - The medial wall separates the middle ear from the inner ear and features structures like the **oval window**, **round window**, and **promontory**. - The scutum is not located on this wall; it pertains to the outermost boundary of the middle ear. *Floor* - The floor of the middle ear is a thin bony plate that separates the middle ear from the **internal jugular vein**. - No part of the scutum is found on the floor of the middle ear cavity.
Practice by Chapter
Skeletal System
Practice Questions
Articular System
Practice Questions
Muscular System
Practice Questions
Cardiovascular System
Practice Questions
Lymphatic System
Practice Questions
Nervous System
Practice Questions
Respiratory System
Practice Questions
Digestive System
Practice Questions
Urinary System
Practice Questions
Reproductive System
Practice Questions
Endocrine System
Practice Questions
Integumentary System
Practice Questions
Want unlimited practice?
Get full access to all questions, explanations, and performance tracking.
Start For Free