Which of the following muscle is not supplied by the marked nerve?
Ans. (b) Superior obliqueRef: Grays Anatomy 41st Ed; Page No- 232* Superior oblique muscles supplied by trochlear nerve.* The marked nerve is Oculomotor Nerve.* Oculomotor Nerve emerges at the midbrain on the medial side of the crus of the cerebral peduncle and passes between the superior cerebellar and posterior cerebral arteries and run forward in the interpeduncular cistern on the lateral side of the posterior communicating artery to reach cavernous sinus.* It enters the cavernous sinus by piercing the posterior part of the roof on the lateral side of the posterior clinoid process, descends along the lateral dural wall of the cavernous sinus, dividing into superior and inferior divisions which run beneath the trochlear and ophthalmic nerve.Nerve supplies of the eyes musclesOculomotorSuperior divisionSuperior rectus and levator palpebrae superioris muscles (LPS)NerveInferior divisionMedial rectus, inferior rectus, and inferior oblique musclesTrochlear Nerve* It passes through the lateral wall of the cavernous sinus, and enters the orbit through the superior orbital fissure.* Nerve supplies the superior oblique muscle.Abducens Nerve* It enters the orbit through the superior orbital fissure.* Nerve supplies the lateral rectus muscle.Cranial Nerves - Components & FunctionNumberNameComponentsFunctionOpening in skullIOlfactory nerveSensory (SVA)Smell sensationOpenings in cribriform plate of ethmoidIIOptic nerveSensory (SSA)VisionOptic canalIIIOculomotorMotor (GSE, GVE)Turns eyeball upward, downward, and medially; Raises upper eyelid, also constricts pupil; accommodates eyeSuperior orbital fissureIVTrochlear nerveMotor (GSE)It helps in turning eyeball downward and laterallySuperior orbital fissureVTrigeminalMaxillary divisionSensory (GSA)Supplies dura mater of anterior part of middle cranial fossa, conjunctiva of inferior eyelid, Skin of face over maxilla; teeth of upper jaw; mucous membrane of nose, the maxillary sinus, and palatePasses through foramen Rotundum to enter pterygopalatine fossa. Ophthalmic divisionSensory (GSA) onlySupplies Cornea, superior conjunctiva, skin of dorsum of external nose, forehead, scalp, Superior eyelids, and also mucous nasal cavity, ethmoid, frontal and sphenoid sinusesSuperior orbital fissure Mandibular divisionSensory (GSA)Skin of lower lip, buccal, parotid and temporal regions of face, external ear (Auricle, tympanic membrane and acoustic meatus), mucous membrane of mouth and anterior two-third part of tongue. Supplies 4 muscles of mastication, mylohyoid, anterior belly of digastric, tensor tympani and tensor veli palatiniPasses THROUGH Foramen Ovale into infratemporal fossa. VIAbducent Motor (GSE)Lateral rectus muscle turns eyeball laterallySuperior orbital fissureVIIFacial Sensory (SVA)Taste from anterior two-thirds of tongue, from floor of mouth and palate Motor (SVE)Muscles of face and scalp, stapedius muscle, posterior belly of digastric and stylohyoid musclesInternal acoustic meatus, facial canal, stylomastoid foramen Secretomotor (GVE) parasympatheticSubmandibular and sublingual salivary glands, the lacrimal gland, and glands of nose and palate VIIIVestibulo-CochlearSensory (SSA)Organ of Corti-- hearing cochlearVestibularSensory (SSA)From utricle and saccule and semicircular canals--position and movement of headInternal acoustic meatusIXGlossopharyngealSensory (GVA, SVA, GSA)General sensation and taste from posterior one-third of tongue and pharynx; carotid sinus (baroreceptor); and carotid body (chemoreceptor) Motor (SVE)Stylopharyngeus muscle--assists swallowingJugular foramen Secretomotor (GVE)parasympathetic Parotid salivary gland XVagus Motor (GVE, SVE)Sensory (GVA, SVA, GSA)Heart and great thoracic blood vessels; larynx, trachea, bronchi, and lungs; alimentary tract from pharynx to splenic flexure of colon; liver, kidneys, and pancreasJugular foramenXISpinal accessorySpinal rootMotor (SVE)Sternocleidomastoid and trapezius muscles Cranial rootMotor (SVE)Muscles of soft palate (except tensor veli palatini), pharynx (except stylopharyngeal, and larynx (except cricothyroid in branches of vagusJugular foramenXIIHypoglossal Motor (GSE)Muscles of tongue (except palatoglossus) controlling its shape and movementHypoglossal canal
Superior rectus
Superior oblique
Medial rectus
Levator palpebrae superioris (LPS)
Head & Neck