Masticatory, Lingual, Hyoid muscles and the Eye Flashcards
Temporalis muscle
origin: temporal fossa
insertion: coronoid process of the mandible
action: Raise mandible (Shut the jaw)
innervation: Mandibular division of the trigeminal n.
Masseter muscle
origin: zygomatic arch
insertion: masseteric fossa, the ventrolateral surface of the ramus of the mandible, and the angular process
action: Raise mandible (Shut the jaw)
innervation: Mandibular division of the trigeminal n.
Pterygoid muscle
medial and lateral;
origin: pterygopalatine fossa
insertion: medial surface and caudal margin of the ramus of the mandible and angular process, ventral to the insertion of the temporal muscle
action: Raise mandible (Shut the jaw)
innervation: Mandibular division of the trigeminal n.
Digastricus muscle
divided into rostral and caudal parts
origin: paracondylar process of the occipital bone
insertion: body of the mandible
action: opens the jaws
innervation: rostral part- mandibular nerve (branch of cranial nerve V), caudal- facial nerve (CN VII)
Zygomatic salivary gland
between the eyeball and pterygoid muscles; hidden laterally bu the zygomatic bone; opens into the vestibule by one main and several minor ducts lateral to the last superior molar tooth
Styloglossus muscle
origin: stylohyoid bone
insertion: middle of the tongue
action: Lift and draw tongue caudal (Move tongue)
innervation: Hypoglossal n.
Hyoglossus muscle
origin: thyrohyoid and basihyoid
insertion: root of the tongue
action: Depress and draw tongue caudal (Move tongue)
innervation: Hypoglossal n.
Genioglossus muscle
origin: intermandibular articulation and adjacent surface of the body of the mandible
insertion: body of the tongue
action: Depress and protrude tongue, retract apex (Move tongue)
innervation: Hypoglossal n.
Sternohyoid muscle
origin: sternum and first costal cartilage
insertion: basihyoid bone
action: Draw tongue and larynx caudally
innervation: Cervical spinal nn.
Thyrohyoid muscle
origin: thyroid cartilage of the larynx
insertion: thyrohyoid bone
action: Draw hyoid apparatus caudally
innervation: Hypoglossal n. (CN XII)
Geniohyoid muscle
origin: on and adjacent to the intermandibular articulation
insertion: basihyoid bone
action: Draw hyoid apparatus and larynx rostrally
innervation: Hypoglossal n. (CN XII)
Periorbita
cone shaped sheath of connective tissue and smooth muscle that encloses the eyeball and its muscles, vessels, and nerves
Lacrimal gland
small, flat lobular structure lying on the medial side of the orbital ligament within the periorbita
Levator palpebrae muscle
origin: apex of the orbit
insertion: as a flat tendon in the upper eyelid
action: Raise upper eyelid
innervation: Oculomotor n. (CN III)
Dorsal oblique muscle
insertion: trochlea
action: Rotation of eye, dorsal part towards midline
innervation: Trochlear n.
Ventral oblique muscle
origin: rostral border of the palatine bone at the level of the maxillary foramen
insertion: sclera at the insertion of the lateral rectus
action: Rotation of eye, ventral part toward midline (opposes action of the dorsal oblique m.)
innervation: Oculomotor n.
Dorsal Rectus muscle
origin: small area around optic canal and optic fissure
insertion: sclera
action: Upward movement of eye
innervation: Oculomotor n.
Lateral Rectus muscle
origin: small area around optic canal and optic fissure
insertion: sclera
action: Abduction of the eye
innervation: Abducent n.
Medial Rectus muscle
origin: small area around optic canal and optic fissure
insertion: sclera
action: Adduction of the eye
innervation: Oculomotor n.
Ventral Rectus muscle
origin: small area around optic canal and optic fissure
insertion: sclera
action: Downward movement of the eye
innervation: Oculomotor n.
Retractor bulbi muscles
sit within the rectus muscles and surround the optic nerve
action: Retraction of eye
innervation: Abducent n.
Trochlea
cartilaginous plaque attached at the level of the medial angle of the eye to the wall of the orbit
Cornea
part of the external fibrous coat, anterior one fourth, transparent, avascular
Sclera
part of the external fibrous coat; forms the posterior three fourths, opaque, vascular
Limbus
corneoscleral junction
Iris and Pupil
iris: circular and radial smooth muscle; pigmented diaphragm with a central opening (pupil)
Mylohyoid muscle
origin: medial surface of the body of the mandible
insertion: midventral raphe; basihyoid bone
action: Draw hyoid apparatus cranially, lift floor of the mouth
innervation: Mandibular division of the trigeminal n.
