UPSC-CMS 2020 — Anatomy

Q: Which one of the following cranial nerves does NOT supply the external ear?

Cranial nerve VI. ***Cranial nerve VI*** - Cranial nerve VI, the **abducens nerve**, solely innervates the **lateral rectus muscle** of the eye, responsible for eye abduction. - It has no known role in the sensory or motor innervation of the external ear. *Cranial nerve V* - The **auriculotemporal nerve**, a branch of the **mandibular division of the trigeminal nerve (V3)**, provides sensory innervation to the anterior aspect of the external ear and the temporomandibular joint. - Therefore, cranial nerve V contributes to the innervation of the external ear. *Cranial nerve IX* - The **glossopharyngeal nerve (IX)** contributes to the innervation of the external ear through its **auricular branch**, which supplies a small area of skin near the external auditory meatus. - This provides some sensory input from the external ear. *Cranial nerve VII* - The **facial nerve (VII)** supplies motor innervation to the **auricular muscles** and provides sensory innervation to a small area of the concha via the **nervus intermedius**. - Its involvement is evident in various reflexes and sensations related to the ear. [Practice more Anatomy PYQs on OnCourse]

Q: Which one of the following is NOT a support of uterus, preventing its descent?

Inguinal ligament. ***Inguinal ligament*** - The **inguinal ligament** is a fibrous band extending from the **anterior superior iliac spine** to the **pubic tubercle**, forming the inferior border of the anterior abdominal wall [2]. - It plays no direct role in supporting the uterus; its primary function is to serve as an attachment site for muscles and define the **inguinal canal** [2]. *Endopelvic fascia* - The **endopelvic fascia** is a connective tissue layer that surrounds pelvic organs and contributes significantly to their support [1]. - It forms condensations such as the **uterosacral** and **cardinal (Mackenrodt's) ligaments**, which directly stabilize the uterus [1]. *Mackenrodt's ligament* - Also known as the **cardinal ligament** or **transverse cervical ligament**, it extends from the cervix and lateral vaginal fornix to the lateral pelvic walls [1]. - This ligament is a primary support of the uterus, preventing its descent and maintaining its position [1]. *Pubocervical ligament* - The **pubocervical ligament** extends from the anterior aspect of the cervix to the posterior surface of the pubic symphysis. - It is a condensation of the **endopelvic fascia** and provides anterior support to the uterus and bladder [1]. [Practice more Anatomy PYQs on OnCourse]

2 Previous Year Questions with Answers & Explanations

Questions

All Subjects Anatomy (2)Anesthesiology (1)Biochemistry (1)Community Medicine (30)Dermatology (1)Forensic Medicine (2)Internal Medicine (13)Microbiology (3)Obstetrics and Gynecology (35)Orthopaedics (2)Pathology (2)Pharmacology (4)Radiology (3)Surgery (20)

Which one of the following cranial nerves does NOT supply the external ear?

Which one of the following is NOT a support of uterus, preventing its descent?

UPSC-CMS 2020 - Anatomy UPSC-CMS Practice Questions and MCQs

Question 1: Which one of the following cranial nerves does NOT supply the external ear?

A. Cranial nerve V
B. Cranial nerve IX
C. Cranial nerve VII
D. Cranial nerve VI (Correct Answer)

Explanation: ***Cranial nerve VI*** - Cranial nerve VI, the **abducens nerve**, solely innervates the **lateral rectus muscle** of the eye, responsible for eye abduction. - It has no known role in the sensory or motor innervation of the external ear. *Cranial nerve V* - The **auriculotemporal nerve**, a branch of the **mandibular division of the trigeminal nerve (V3)**, provides sensory innervation to the anterior aspect of the external ear and the temporomandibular joint. - Therefore, cranial nerve V contributes to the innervation of the external ear. *Cranial nerve IX* - The **glossopharyngeal nerve (IX)** contributes to the innervation of the external ear through its **auricular branch**, which supplies a small area of skin near the external auditory meatus. - This provides some sensory input from the external ear. *Cranial nerve VII* - The **facial nerve (VII)** supplies motor innervation to the **auricular muscles** and provides sensory innervation to a small area of the concha via the **nervus intermedius**. - Its involvement is evident in various reflexes and sensations related to the ear.

Question 2: Which one of the following is NOT a support of uterus, preventing its descent?

A. Endopelvic fascia
B. Mackenrodt's ligament
C. Pubocervical ligament
D. Inguinal ligament (Correct Answer)

Explanation: ***Inguinal ligament*** - The **inguinal ligament** is a fibrous band extending from the **anterior superior iliac spine** to the **pubic tubercle**, forming the inferior border of the anterior abdominal wall [2]. - It plays no direct role in supporting the uterus; its primary function is to serve as an attachment site for muscles and define the **inguinal canal** [2]. *Endopelvic fascia* - The **endopelvic fascia** is a connective tissue layer that surrounds pelvic organs and contributes significantly to their support [1]. - It forms condensations such as the **uterosacral** and **cardinal (Mackenrodt's) ligaments**, which directly stabilize the uterus [1]. *Mackenrodt's ligament* - Also known as the **cardinal ligament** or **transverse cervical ligament**, it extends from the cervix and lateral vaginal fornix to the lateral pelvic walls [1]. - This ligament is a primary support of the uterus, preventing its descent and maintaining its position [1]. *Pubocervical ligament* - The **pubocervical ligament** extends from the anterior aspect of the cervix to the posterior surface of the pubic symphysis. - It is a condensation of the **endopelvic fascia** and provides anterior support to the uterus and bladder [1].