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]

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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?