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Muscles and Blood Vessels of the Head and Neck
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45
Anatomy
Undergraduate 1
03/29/2016

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Term
sclera
Definition
where do the 6 extrinsic eye muscles attach to?
Term
inferior rectus muscle
Definition
comes inferior and comes in straight; when it contracts it depresses eyeball
Term
CNIII (oculomotor)
Definition
what nerve innervates the inferior rectus muscle?
Term
medial rectus muscle
Definition
comes in medially; adducts eyeball
Term
CNIII (oculomotor)
Definition
what nerve innervates the medial rectus muscle?
Term
superior rectus muscle
Definition
superior and straight; when it contracts it elevates the eye
Term
CNIII (oculomotor)
Definition
what nerve innervates the superior rectus muscle?
Term
lateral rectus muscle
Definition
causes eye to abduct
Term
CNVI (abducens)
Definition
what nerve innervates the lateral rectus muscle?
Term
inferior oblique muscle
Definition
helps to rotate the eyeball (upward and lateral)
Term
CNIII (oculomotor)
Definition
what nerve innervates the inferior oblique muscle?
Term
superior rectus muscle
Definition
helps rotate eye (downward and laterally--down and out muscle); goes through loop of connective tissue so it can reverse its angle called the trochlea
Term
CNIV trochlear nerve
Definition
what nerve innervates the superior oblique muscle?
Term
extrinsic
Definition
the extrinsic or intrinsic muscles are involved with moving the tongue in various directions?
Term
intrinsic
Definition
the extrinsic or intrinsic muscles are involved with altering the shape of the tongue?
Term
hypoglossal nerve (CNXII)
Definition
what nerve innervates all the muscles of the tongue?
Term
1. stloglossus m.
2. hypoglossus m.
3. genioglossus m.
Definition
what are the 3 extrinsic muscles of the tongue?
Term
styloglossus m.
Definition
orginates on the styloid process of the temporal bone; elevates the tongue and draws it posteriorly (retraction)
Term
hypoglossus m.
Definition
originates on the hyoid bone; depresses the tongue
Term
genioglossus m.
Definition
originates on the mandible; protracts tongue--stick tongue out
Term
the facial nerve (CNVII)
Definition
what nerves innervate the facial nerves?; originate on the surface of the skull and insert into the superficial fascia and dermis of skin; when they contractm they move the skin
Term
frontalis m.
Definition
also known as the frontal belly of the occipitofrontalis m.; draws scalp anteriorly, raises eyebrows, and wrinkles forehead
Term
epicranial aponeurosis
Definition
connects frontalis and occipitofrontalis muscle
Term
occipitalis m.
Definition
also known as the occipital belly of the occipitofrontalis m. draws scalp posteriorly
Term
orbicularis oculi m.
Definition
encircles eye; closes the eye
Term
buccinators m.
Definition
presses cheeks against teeth and lips, as in whistling, blowing, and sucking; also keeps food from getting between teeth and cheeks when chewing
Term
orbicularis oris m.
Definition
encircles the mouth; closes and protrudes lips (pouting lips)
Term
platysma m.
Definition
draws out part of lower lip inferiorly and posteriorly as in pouting; tenses skin of neck; very thin-lying over neck and goes down to shoulder and thorax--very superficial; extends all the way up to the corners of the mouth
Term
mandibular division of the trigeminal nerve (CNV)
Definition
what nerve innervates the muscles of mastication?
Term
1. temporalis m.
2. masseter m.
3. lateral pterygoid m.
4. medial pterygoid m.
Definition
what are the four pairs of mastication muscles?
Term
temporalis m.
Definition
runs from the temporal fossa to the coronoid process of mandible; elevates (closes) and retracts the mandible
Term
masseter m.
Definition
runs from zygomatic arch to the lateral surface of the angle of the mandible; elevates (closes the mandible)
Term
lateral pterygoid m.
Definition
runs from the lateral side of the lateral pterygoid plate to the condyle of the mandible; DEPRESSES (OPENS) THE MANDIBLE (gravity helps open the mouth so that's why we dont need as many muscles to open mouth), protracts (protrudes) the mandible, and moves it from side to side to help with grinding
Term
medial pterygoid m.
Definition
runs from the medial side of the lateral pterygoid plate to the medial surface of the angle of the mandible; elevates (closes) the mandible, protracts (protrudes) the mandible, and moves it from side to side to help with grinding
Term
sternocleidomastoid m and trapezius m.
Definition
what are the 2 muscles of the neck that are innervated by the accessory nerve (CNXI)?
Term
trapeius m.
Definition
forms the contour of the posterior neck; many of the actions involve the movement of the scapula, but the trapezius can also help extend the head
Term
sternocleidomastoid m.
Definition
originates on the sternum and the medial portion of the clavicle and inserts onto the mastoid process of the temporal bone; bilaterally, it rotates head to the side opposite the contracting muscle (platysma muscle is superficial to this muscle)
Term
trapezius and sternocleidomastoid
Definition
what two muscles make up the posterior triangle of the neck?
Term
internal carotid and external carotid a
Definition
each common carotid a. bifurcates into what two arteries?
Term
internal carotid a.
Definition
has no branches in the neck and supplies structures internal to the skull (brain) and orbit (eye)
Term
external carotid a.
Definition
supplies the neck and structures of the head external to the skull
Term
carotid sinus
Definition
baroreceptor (a type of mechanoreceptor); detects blood pressure-sends signal to brain (medulla because we have autonomic reflex center-housing visceral nuclei) through CNIX; information used to regulate heart rate
Term
carotid body
Definition
chemoreceptor; detects concentration of oxygen in the blood-information sent to medulla because it houses respiratory centers; information used to regulate respiration rate
Term
internal jugular vein
Definition
returns blood from inside the skull (brain)
Term
external jugular vein
Definition
returns blood from areas of the head external to the skull, as well as the neck and face
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