Head — Flashcards

Flashcard 281: Which structure separates the superficial squamosal cells from the deep petrosal cells of the mastoid?

Answer: Koerner’s septum (Petrosquamous suture)

Flashcard 282: Which muscle plays a role in winking?_____

Answer: Orbicularis oculi

Flashcard 283: Foramen of the skull:The superior part of foramen lacerum is traversed by _____

Answer: internal carotid artery

Flashcard 284: Branches of Mandibular nerve:Muscular branches of the anterior division supply the _____ muscles

Answer: Masseter, Temporalis, and Lateral pterygoid

Extra: The anterior division of the mandibular nerve (V3) is primarily motor and supplies three of the four muscles of mastication: 1. **Masseter** (via masseteric nerve) 2. **Temporalis** (via deep temporal nerves) 3. **Lateral pterygoid** (via nerve to lateral pterygoid) Note: The **Medial pterygoid** is supplied by the main trunk of V3, not the anterior division. The only sensory branch of the anterior division is the buccal nerve.

Flashcard 285: _____ sinus opens into the sphenoethmoidal recess

Answer: Sphenoid

Flashcard 286: Each nasal cavity communicates with the nasopharynx through the posterior nasal aperture or the _____

Answer: choana

Flashcard 287: What is the narrowest part of the Eustachian tube?

Answer: The junction of the bony and cartilaginous parts (isthmus)

Flashcard 288: What is the name of the unpaired cartilage of the nose?

Answer: Septal cartilage

Extra: The nasal septum is formed by the septal cartilage (unpaired), the perpendicular plate of the ethmoid bone, and the vomer bone.

Flashcard 289: _____ mm of the cornea is naturally covered by upper eyelid

Answer: 2

Flashcard 290: Longest extraocular muscle: _____

Answer: Superior oblique