Head Practice Questions

Q: Which of the following foramen transmits maxillary nerve?

Foramen rotundum. ***Foramen rotundum*** - The **maxillary nerve (V2)**, which is the second division of the trigeminal nerve, exits the middle cranial fossa through the foramen rotundum. - This foramen connects the middle cranial fossa to the **pterygopalatine fossa**. *Foramen ovale* - The foramen ovale transmits the **mandibular nerve (V3)**, which is the third division of the trigeminal nerve. - It also transmits the accessory meningeal artery and the lesser petrosal nerve. *Foramen spinosum* - The foramen spinosum transmits the **middle meningeal artery** and the meningeal branch of the mandibular nerve. - It is a small opening located posterolateral to the foramen ovale. *Foramen lacerum* - The foramen lacerum is a jagged opening filled with **fibrocartilage** in the living individual. - While some small vessels and nerves pass over it, no major cranial nerve passes *through* it in its entirety; the **internal carotid artery** passes over its superior aspect.

Q: The image shows the parotid gland. Through which ganglion does the secretomotor supply to the parotid gland pass?

Otic ganglion. ***Otic ganglion*** - The **glossopharyngeal nerve (CN IX)** provides secretomotor innervation to the parotid gland. - The preganglionic parasympathetic fibers from CN IX travel via the **lesser petrosal nerve** and synapse in the **otic ganglion**. - Postganglionic fibers then travel with the **auriculotemporal nerve (branch of CN V3)** to innervate the parotid gland for salivary secretion. *Ciliary ganglion* - This is the parasympathetic ganglion associated with the **oculomotor nerve (CN III)**. - It provides postganglionic fibers for pupillary constriction and accommodation, not salivary secretion. *Pterygopalatine ganglion* - This is the parasympathetic ganglion associated with the **facial nerve (CN VII)** via the greater petrosal nerve. - It supplies the lacrimal gland and nasal/palatine glands, not the parotid gland. *Submandibular ganglion* - This is another parasympathetic ganglion associated with the **facial nerve (CN VII)** via the chorda tympani. - It supplies the submandibular and sublingual salivary glands, not the parotid gland.

Q: 80.

The provided content lacks specific questions and options, but given the image displaying muscles of the tongue and floor of the mouth, a typical question would be to identify one of the labeled structures. ***Hyoglossus*** - This muscle **depresses** and **retracts** the tongue. - It originates from the **hyoid bone** and inserts into the side of the tongue. *Palatoglossus* - This muscle forms the **anterior palatine arch** and elevates the posterior part of the tongue and depresses the soft palate. - It is innervated by the **vagus nerve** (CN X), unlike other tongue muscles innervated by the hypoglossal nerve. *Styloglossus* - This muscle originates from the **styloid process** and retracts and elevates the tongue. - It works in conjunction with the genioglossus and hyoglossus muscles for tongue movements. *Genioglossus* - This is the largest and strongest extrinsic tongue muscle, primarily responsible for **protruding** the tongue. - It also depresses the central part of the tongue. *Geniohyoid* - This muscle runs from the **chin (genio-) to the hyoid bone**. - It elevates the hyoid bone and moves it anteriorly, or depresses the mandible when the hyoid is fixed. *Mylohyoid muscle (cut)* - This muscle forms the **floor of the mouth**. - Its fibers run transversely from the inner surface of the mandible to converge at the median raphe and the hyoid bone, elevating the hyoid bone and the floor of the mouth during swallowing.

Q: The antagonist of superior rectus is:

Inferior rectus. ***Inferior rectus*** - The **superior rectus** muscle's primary action is **elevation** of the eye, while the **inferior rectus** muscle's primary action is **depression** of the eye, making them direct antagonists. - Additionally, the superior rectus causes **intorsion** (medial rotation) while the inferior rectus causes **extorsion** (lateral rotation), further opposing each other's actions. *Superior oblique* - The **superior oblique** muscle primarily causes **depression** and **intorsion**, but it's not the direct antagonist of the superior rectus. - Its primary antagonist is the **inferior oblique** muscle, not the superior rectus. *Inferior oblique* - The **inferior oblique** muscle causes **elevation** and **extorsion**, which partially opposes some actions of the superior rectus. - However, it's not the direct antagonist as both muscles cause **elevation** as their primary action. *Lateral rectus* - The **lateral rectus** muscle causes **abduction** (outward movement) of the eye. - Its antagonist is the **medial rectus** muscle, and it has no direct opposing relationship with the superior rectus muscle.

Q: The image shows the lateral pterygoid muscle. What is the primary action of this muscle on the mandible?

Depression. ***Depression*** - The **lateral pterygoid muscle** is the primary muscle responsible for **depression of the mandible** (opening the mouth). - It pulls the **mandibular condyle** and articular disc anteriorly and inferiorly out of the mandibular fossa. - This action initiates mouth opening by lowering the mandible. *Elevation* - **Elevation** of the mandible (closing the mouth) is performed by the **masseter**, **temporalis**, and **medial pterygoid muscles**. - The lateral pterygoid does not contribute to elevation; it opposes this action. *Protrusion* - While the lateral pterygoid does contribute to **protrusion** (forward movement of the mandible), this is a **secondary action**. - The **primary and most important function** is depression of the mandible for mouth opening. - Bilateral contraction causes protrusion, while unilateral contraction causes lateral deviation. *Mouth closure* - **Mouth closure** involves mandibular elevation and retrusion, achieved by the **masseter**, **temporalis**, and **medial pterygoid muscles**. - The lateral pterygoid opposes mouth closure by opening the mouth and moving the mandible forward.

Q: Which of the following is correct about the image shown below?

A = Sphenoid sinus, B= Auditory tube opening. ***A = Sphenoid sinus, B= Auditory tube opening*** - Label **A** clearly points to the **sphenoid sinus**, an air-filled cavity within the sphenoid bone, located posterior to the nasal cavity and inferior to the sella turcica. - Label **B** indicates the opening of the **auditory (Eustachian) tube** in the lateral wall of the nasopharynx, connecting the nasopharynx to the middle ear. *A = Cisterna magna, B= Posterior nasal aperture* - **Cisterna magna** is a subarachnoid space located posterior to the cerebellum and medulla, not visible at this anterior anatomical location. - The **posterior nasal aperture (choana)** is the opening between the nasal cavity and the nasopharynx, which is located more anteriorly and inferiorly relative to point B. *A = Ethmoidal sinus, B= Auditory tube opening* - The **ethmoidal sinuses** are located anterior to the sphenoid sinus, within the ethmoid bone, and would appear more superior and anterior to where A is located. - While B is correctly identified as the auditory tube opening, A is misplaced for the ethmoidal sinus. *A = Sella turcica, B= Posterior nasal aperture* - The **sella turcica** is a saddle-shaped depression in the sphenoid bone, superior to the sphenoid sinus, which houses the pituitary gland. - The **posterior nasal aperture** is incorrect for B, as explained above.

Q: The highlighted part in the image is called

Pterion. ***Pterion*** - The highlighted region indicates the **pterion**, a clinically significant area on the side of the skull where four skull bones (frontal, parietal, sphenoid, and temporal) meet. - It is a common site for trauma, as the middle meningeal artery lies deep to it, making it vulnerable to **epidural hematomas** if fractured.

Q: The image shows $\qquad$ (marked by green arrow):

Optic canal. ***Optic canal*** - The green arrow points to a rounded opening superior and medial to the larger, irregular opening, which is characteristic of the **optic canal**. - The optic canal transmits the **optic nerve (CN II)** and the **ophthalmic artery** from the orbit to the middle cranial fossa. *Superior orbital fissure* - The **superior orbital fissure** is typically a larger, more irregular, and elongated opening located lateral and inferior to the optic canal. - It transmits multiple structures including **cranial nerves III, IV, V1, VI**, and the **superior ophthalmic vein**. *Anterior ethmoidal foramen* - The **anterior ethmoidal foramen** is a much smaller opening, typically found on the medial wall of the orbit, between the frontal and ethmoid bones. - It transmits the **anterior ethmoidal nerve** and vessels to the ethmoid sinuses and nasal cavity. *Posterior ethmoidal foramen* - The **posterior ethmoidal foramen** is also a small opening, located posterior to the anterior ethmoidal foramen on the medial wall of the orbit. - It transmits the **posterior ethmoidal nerve** and vessels.

Q: Identify the foramen marked below as $X$ :

Foramen ovale. ***Foramen ovale*** - The foramen ovale is an **oval-shaped opening** located in the **greater wing of the sphenoid bone**, just posterior to the foramen rotundum and lateral to the foramen lacerum. - It transmits the **mandibular nerve (V3)**, **accessory meningeal artery**, lesser petrosal nerve, and emissary veins. *Foramen rotundum* - The foramen rotundum is a **round opening** situated in the **greater wing of the sphenoid bone**, anterior to the foramen ovale. - It primarily transmits the **maxillary nerve (V2)**. *Foramen spinosum* - The foramen spinosum is a **small opening** located posterolateral to the foramen ovale, also in the **greater wing of the sphenoid bone**. - It transmits the **middle meningeal artery**, middle meningeal vein, and a recurrent branch of the mandibular nerve. *Foramen lacerum* - The foramen lacerum is an **irregularly shaped opening** located at the base of the skull, medial to the foramen ovale, formed by the sphenoid, petrous temporal, and occipital bones. - It is **closed off in vivo by cartilage** and primarily transmits some emissary veins and the nerve to the pterygoid canal, not major neural or vascular structures directly through its bony canal.

Question 1

Which of the following foramen transmits maxillary nerve?

Accepted Answer

Foramen rotundum

Answer

Foramen ovale

Answer

Foramen spinosum

Answer

Foramen lacerum

Question 2

The image shows the parotid gland. Through which ganglion does the secretomotor supply to the parotid gland pass?

Accepted Answer

Otic ganglion

Answer

Ciliary ganglion

Answer

Pterygopalatine ganglion

Answer

Submandibular ganglion

Question 3

80.

Question 4

Identify the structure labeled as genioglossus in the given image showing a sagittal view of the oral cavity and pharynx.

Accepted Answer

Genioglossus

Answer

Hyoglossus

Answer

Palatoglossus

Answer

Styloglossus

Question 5

The antagonist of superior rectus is:

Accepted Answer

Inferior rectus

Answer

Superior oblique

Answer

Inferior oblique

Answer

Lateral rectus

Question 6

The image shows the lateral pterygoid muscle. What is the primary action of this muscle on the mandible?

Accepted Answer

Depression

Answer

Elevation

Answer

Protrusion

Answer

Mouth closure

Question 7

Which of the following is correct about the image shown below?

Accepted Answer

A = Sphenoid sinus, B= Auditory tube opening

Answer

A = Cisterna magna, B= Posterior nasal aperture

Answer

A = Ethmoidal sinus, B= Auditory tube opening

Answer

A = Sella turcica, B= Posterior nasal aperture

Question 8

The highlighted part in the image is called

Accepted Answer

Pterion

Answer

Bregma

Answer

Asterion

Answer

Lambda

Question 9

The image shows $\qquad$ (marked by green arrow):

Accepted Answer

Optic canal

Answer

Superior orbital fissure

Answer

Anterior ethmoidal foramen

Answer

Posterior ethmoidal foramen

Question 10

Identify the foramen marked below as $X$ :

Accepted Answer

Foramen ovale

Answer

Foramen rotundum

Answer

Foramen spinosum

Answer

Foramen lacerum

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