Head Practice Questions

Q: Secretomotor innervation to the parotid gland relays in:

Otic ganglion. Otic ganglion - The **otic ganglion** is a parasympathetic ganglion associated with the **glossopharyngeal nerve (CN IX)**. - Postganglionic parasympathetic fibers from the otic ganglion innervate the **parotid gland**, stimulating saliva production. Geniculate - The **geniculate ganglion** is a sensory ganglion of the **facial nerve (CN VII)**, located in the facial canal. - It contains cell bodies for taste sensation from the anterior two-thirds of the tongue and general sensation from a small area near the ear, but is not involved in parotid gland innervation. Pterygopalatine - The **pterygopalatine ganglion** is a parasympathetic ganglion associated with the **facial nerve (CN VII)**, via the greater petrosal nerve. - It provides secretomotor innervation to the **lacrimal gland** and glands of the nasal cavity and palate, but not the parotid gland. Ciliary - The **ciliary ganglion** is a parasympathetic ganglion associated with the **oculomotor nerve (CN III)** [1]. - It provides parasympathetic innervation to the **sphincter pupillae** and **ciliary muscle**, controlling pupil constriction and accommodation [1].

Q: What is the action of the muscle marked with an arrow on the mandible?

Elevation of the mandible. ***Elevation of the mandible*** - The muscle indicated by the arrow is the **masseter muscle**, a powerful muscle of mastication. - The primary action of the **masseter** is to **elevate the mandible**, closing the mouth and clamping the teeth. *Lowering of the mandible* - Lowering (depression) of the mandible is primarily performed by the **lateral pterygoid**, digastric, geniohyoid, and mylohyoid muscles. - The **masseter** is directly responsible for the opposite action of elevation. *Pulling back of the mandible* - Pulling back, or **retrusion**, of the mandible is mainly performed by the posterior fibers of the **temporalis muscle** and the suprahyoid muscles. - The **masseter** has a more vertical orientation, making it ineffective for retrusion. *Pushing forward of the mandible* - Pushing forward, or **protrusion**, of the mandible is primarily carried out by the **lateral pterygoid** and medial pterygoid muscles. - The **masseter's** main fibers are not oriented to produce a significant protrusive force.

Q: Secretomotor fibers to the parotid salivary gland are supplied by?

Otic ganglion. ***Otic ganglion*** - The **otic ganglion** is a parasympathetic ganglion associated with the **glossopharyngeal nerve (CN IX)**. - Preganglionic fibers travel via the **lesser petrosal nerve** and synapse in the otic ganglion. - Postganglionic parasympathetic fibers from the otic ganglion travel with the **auriculotemporal nerve** (branch of CN V3) to innervate the **parotid gland**, stimulating saliva production. *Pterygoid ganglion (Pterygopalatine ganglion)* - This refers to the **pterygopalatine ganglion** (also called sphenopalatine ganglion), which is associated with the **facial nerve (CN VII)**. - The pterygopalatine ganglion provides secretomotor innervation to the **lacrimal gland** and glands of the **nasal cavity** and **palate**, not the parotid gland. *Submandibular ganglion* - The **submandibular ganglion** is associated with the **facial nerve (CN VII)** via the **chorda tympani**. - It supplies secretomotor innervation to the **submandibular** and **sublingual salivary glands**. *Hypoglossal ganglion* - This is **not a recognized autonomic ganglion** involved in salivary gland innervation. - The term historically referred to the superior ganglion of the vagus nerve, but has no role in parotid secretion. - The **hypoglossal nerve (CN XII)** is primarily a **motor nerve** that controls the intrinsic and extrinsic muscles of the tongue.

Q: Anterior fontanelle corresponds to all structures except which of the following?

Lambdoid suture. ***Lambdoid suture*** - The **anterior fontanelle** is located at the intersection of the **coronal**, **sagittal**, and **metopic sutures** [1]. - It is bounded by the **frontal bones anteriorly** and the **parietal bones posteriorly** [1]. - The **lambdoid suture** is located at the posterior aspect of the skull, separating the parietal bones from the occipital bone, and corresponds to the **posterior fontanelle**, NOT the anterior fontanelle [1]. - This is the structure that does NOT correspond to the anterior fontanelle. *Frontal bones* - The **frontal bones** (or two halves of the frontal bone before fusion) form the anterior boundary of the anterior fontanelle [1]. - The anterior fontanelle is located where the frontal bones meet the parietal bones [1]. *Coronal suture* - The **coronal suture** forms part of the lateral boundaries of the anterior fontanelle, separating the frontal bone from the parietal bones [1]. - It runs transversely across the top of the skull on both sides. *Sagittal suture* - The **sagittal suture** runs through the middle of the anterior fontanelle, lying between the two parietal bones [1]. - It extends longitudinally along the midline from the anterior fontanelle posteriorly to the posterior fontanelle [1].

Q: Which of the following arteries is a branch of the facial artery?

Inferior labial, superior labial, lateral nasal, angular. ***Inferior labial, superior labial, lateral nasal, angular*** - The **facial artery** is a major branch of the **external carotid artery** that supplies the face. - Its key branches include the **inferior labial**, **superior labial**, **lateral nasal**, and **angular arteries**, which contribute to the blood supply of the lips, nose, and medial canthus of the eye. *Ascending palatine, superficial temporal, submental, inferior labial* - The **superficial temporal artery** is a terminal branch of the **external carotid artery**, not the facial artery. - While the **ascending palatine** and **submental arteries** are branches of the facial artery, including the superficial temporal artery makes this option incorrect. *Infraorbital, dorsal nasal, deep facial, mental* - The **infraorbital artery** and **mental artery** are branches of the **maxillary artery**, which is another branch of the external carotid artery, not the facial artery. - The **dorsal nasal artery** is typically a terminal branch of the **ophthalmic artery**, which arises from the internal carotid artery. *Superior thyroid, lingual, facial, maxillary* - These are all **major branches of the external carotid artery** itself, not branches of the facial artery. - The question specifically asks for branches *of* the facial artery.

Q: Which of the following is the LARGEST paranasal sinus that drains directly into the middle meatus?

Maxillary sinus. ***Maxillary sinus*** - The **maxillary sinus** is the **largest paranasal sinus** (volume 15-20 ml) and drains directly into the **middle meatus** through the **semilunar hiatus** (ostium in the hiatus semilunaris) - Being both the largest and draining into the middle meatus, it satisfies both criteria in the question - Its clinical significance is highlighted by maxillary sinusitis being the most common type of sinusitis *Frontal sinus* - The **frontal sinus** drains into the **middle meatus** through the **frontonasal duct** (infundibulum) - While it drains to the middle meatus, it is **not the largest** paranasal sinus - the maxillary sinus is significantly larger - It is the second largest sinus after the maxillary sinus *Anterior ethmoid sinus* - The **anterior ethmoid sinuses** drain into the **middle meatus** via the **ethmoid bulla** and infundibulum - Like the frontal sinus, it drains to the middle meatus, but it is **not the largest** paranasal sinus - The ethmoid air cells are much smaller than the maxillary sinus *Posterior ethmoid sinus* - The **posterior ethmoid sinuses** drain into the **superior meatus**, **NOT the middle meatus** - This option fails to meet the drainage criterion specified in the question - This makes it incorrect regardless of size considerations

Q: Which of the following is not a part of the ethmoidal bone?

Inferior nasal concha. ***Inferior nasal concha*** - The **inferior nasal concha** is an independent facial bone, *not* a part of the ethmoid bone. - It forms the lower part of the lateral wall of the nasal cavity and has its own ossification centers separate from the ethmoid. *Uncinate process* - The **uncinate process** is a hook-shaped bony projection of the ethmoid bone. - It forms part of the medial wall of the **maxillary hiatus** and is crucial for the drainage of the paranasal sinuses. *Agger nasi* - The **agger nasi** (or nasal mound) is an anatomical variation which is an anterior extension of the ethmoid bone's uncinate process or an anterior ethmoid air cell. - It is located anterior and superior to the attachment of the middle turbinate, representing an ethmoidal cell. *Crista galli* - The **crista galli** is a strong, vertical, midline projection of the ethmoid bone. - It projects superiorly into the **cranial cavity** and serves as an attachment site for the **falx cerebri**. Note: None of the provided references contain anatomical descriptions of the ethmoid bone structures listed in this question. Therefore, no citations were added.

Q: Which of the following structures is not found in the parotid gland?

Buccal branch of mandibular nerve. ***Buccal branch of mandibular nerve*** - The **buccal branch of the mandibular nerve (V3)** is not found within the parotid gland. It innervates the buccinator muscle and provides sensory innervation to the buccal mucosa. - The facial nerve, after exiting the stylomastoid foramen, branches within the parotid gland, but the *mandibular nerve* and its branches are distinct structures. *ECA* - The **external carotid artery (ECA)** runs *through* the parotid gland before dividing into its terminal branches, the superficial temporal and maxillary arteries. - This is a major landmark for surgeons operating on the parotid gland. *Facial nerve* - The **facial nerve (cranial nerve VII)** enters the parotid gland and then divides into its five terminal branches (temporal, zygomatic, buccal, marginal mandibular, cervical) *within* the gland. - These branches are responsible for innervating the muscles of facial expression. *Auriculotemporal nerve* - The **auriculotemporal nerve**, a branch of the mandibular nerve (V3), travels *through* the parotid gland. - It carries postganglionic parasympathetic fibers from the otic ganglion to the parotid gland, providing secretomotor innervation.

Q: Which structure contributes to the formation of the arcuate eminence of the petrous temporal bone?

Superior semicircular canal. ***Superior semicircular canal*** - The **superior semicircular canal** is positioned in such a way that its arch creates the **arcuate eminence** on the anterior surface of the petrous part of the temporal bone. - This anatomical relationship is a key landmark when viewing the internal aspect of the skull base. *Posterior semicircular canal* - The **posterior semicircular canal** is located more posteriorly and inferiorly within the petrous bone and does not contribute to the arcuate eminence. - It is oriented in a plane roughly perpendicular to the superior canal. *Lateral semicircular canal* - The **lateral semicircular canal** is situated horizontally and anteriorly within the petrous bone, also not forming the arcuate eminence. - It is responsible for detecting angular acceleration in the transverse plane. *Cochlea* - The **cochlea** is the organ of hearing, located anterior to the vestibule within the inner ear, and is not structurally related to the formation of the arcuate eminence. - Its spiral shape is distinct from the semicircular canals which sense head rotation.

Question 1

Secretomotor innervation to the parotid gland relays in:

Accepted Answer

Otic ganglion

Answer

Geniculate

Answer

Ciliary

Answer

Pterygopalatine

Question 2

What is the action of the muscle marked with an arrow on the mandible?

Accepted Answer

Elevation of the mandible

Answer

Lowering of the mandible

Answer

Pulling back of the mandible

Answer

Pushing forward of the mandible

Question 3

All of the following are true of the maxillary artery except:

Accepted Answer

It passes deep between the two heads of lateral pterygoid muscle into the pterygopalatine fossa

Answer

It is the arterial supply for mandible

Answer

It is one of the terminal branches of ECA

Answer

The branches of maxillary artery accompany the branches of maxillary nerve

Question 4

Secretomotor fibers to the parotid salivary gland are supplied by?

Accepted Answer

Otic ganglion

Answer

Pterygoid ganglion

Answer

Submandibular ganglion

Answer

Hypoglossal ganglion

Question 5

Anterior fontanelle corresponds to all structures except which of the following?

Accepted Answer

Lambdoid suture

Answer

Coronal suture

Answer

Sagittal suture

Answer

Frontal bones

Question 6

Which of the following arteries is a branch of the facial artery?

Accepted Answer

Inferior labial, superior labial, lateral nasal, angular

Answer

Infraorbital, dorsal nasal, deep facial, mental

Answer

Ascending palatine, superficial temporal, submental, inferior labial

Answer

Superior thyroid, lingual, facial, maxillary

Question 7

Which of the following is the LARGEST paranasal sinus that drains directly into the middle meatus?

Accepted Answer

Maxillary sinus

Answer

Frontal sinus

Answer

Posterior ethmoid sinus

Answer

Anterior ethmoid sinus

Question 8

Which of the following is not a part of the ethmoidal bone?

Accepted Answer

Inferior nasal concha

Answer

Uncinate process

Answer

Agger nasi

Answer

Crista galli

Question 9

Which of the following structures is not found in the parotid gland?

Accepted Answer

Buccal branch of mandibular nerve

Answer

Facial nerve

Answer

ECA

Answer

Auriculotemporal nerve

Question 10

Which structure contributes to the formation of the arcuate eminence of the petrous temporal bone?

Accepted Answer

Superior semicircular canal

Answer

Posterior semicircular canal

Answer

Lateral semicircular canal

Answer

Cochlea

Head — MCQs

Head — MCQs

On this page

Practice by Chapter

Want unlimited practice?