Question 1: Identify the nerve marked with an arrow in the given section of cranial cavity.
- A. Trochlear
- B. Trigeminal
- C. Oculomotor
- D. Abducens (Correct Answer)
- E. Facial
Explanation: ***Abducens***
- The image shows the abducens nerve passing through **Dorello's canal** on its way to the **cavernous sinus**.
- Its unique path makes it susceptible to injury in cases of increased intracranial pressure, leading to **lateral rectus palsy**.
*Trochlear*
- The trochlear nerve is the **smallest cranial nerve** and exits the brainstem dorsally, then wraps around to the ventral side.
- It innervates the **superior oblique muscle** of the eye.
*Trigeminal*
- The trigeminal nerve is a large cranial nerve with **three main divisions** and is responsible for sensations in the face and motor functions like chewing.
- It arises more laterally from the pons and is typically seen entering the **Meckel's cave**.
*Oculomotor*
- The oculomotor nerve emerges from the **midbrain** and controls most of the extrinsic eye muscles and pupillary constriction.
- It is usually visible superior to the abducens nerve in the **cavernous sinus**.
*Facial*
- The facial nerve exits the brainstem at the **cerebellopontine angle** and enters the **internal acoustic meatus** with the vestibulocochlear nerve.
- It controls muscles of **facial expression** and carries taste sensation from the anterior two-thirds of the tongue.
