Flashcards in Neck: bones, fascia, posterior triangle Deck (70)
3rd part of the subclavian artery lies ____ and ____ to the subclavian vein, emerging between what two muscles?
posterior and superior.
emerging between anterior and middle scalenes
3rd part of the subclavian artery: crosses over ___ ____ to become axillary, and usually gives rise to what?
crosses over 1st rib
dorsal scapular artery
the neck is relatively slender and flexible to allow for what?
efficient use of sensory organs
the hyoid bone is at what C level? what is it suspended between?
Suspended between styloid process & thyroid cartilage
C__ has a carotid tubercle. while C__ has longer spinous processes that is NOT bifid (aka ____ _____)
C7- vertebrae prominens
what is clinically important about facet joints of cervical vertebrae?
facet joints are zygopophysial (in transverese plane- slope inferior-laterally- (not truly horizontal) ) - permits flexion, extension, lateral flexion.
which is the widest cervical vertebrae with no body or spinous process?
which cervical vertebrae? ... Ring-shaped with large lateral masses (support occipital condyles of cranium). Transverse ligament between
Strongest cervical vertebrae
which cervical vertebrae has the Dens (odontoid process)-superior projection from body?
vertebral arteries begin ascent at level C__
hyoid bone is in the angle between ____ and _____ _______.
Angle between mandible & thyroid cartilage
hyoid bone is suspended by the _____ _______. connected by muscles to what 4 things?
Suspended by stylohyoid ligament
Connected by muscles to skull, thyroid cartilage, manubrium, & pectoral girdle
the hyoid bone has what 3 parts? what is are its two purposes?
Body, lesser horns, greater horns
Adds rigidity to airway & attachments for anterior cervical muscles
what are the 4 layers of cervical fascia?
3 separate deep columns: Investing, Pretracheal, Prevertebral
what are the 3 functions of cervical fascia?
Compartmentalize muscles & viscera
Conduit for neurovascular structures
Allows gliding of structures
what cervical fascia is just Deep to dermis, very thin? what two structures are within this layer?
superficial layer (aka hypodermis, aka subcutaneous)
- platysma muscle (highly variable)
-external jugular vein (anterolaterally)
what is the platsyma muscle used for? what is it innervated by?
Cervical branch of facial nerve (CN VII)
how wide and how thick is the platysma? where is it located?
about 1mm thick, about 1 hands width on either side.
-starts at body of mandible and fans down to clavicles. does NOT meet in the midline.
investing deep cervical fascia, splits to invest what two muscles? invests what two glands?
muscles: sternocleidomastoid & trapezius
glands: submandibular & parotid
origins, insertions and innervations of SCM and trapezius muscle ?
Nearly continuous origins at base of skull
Nearly continuous insertions to scapular spine, acromion, clavicle, & manubrium
Both muscles innervated by spinal accessory nerve (CN XI)
pretrachial deep cervical fascia invests what two types of structures? extends from _____ to ______.
Invests muscles & viscera in anterior neck
Extends from hyoid to pericardium of heart
the pretrachial deep cervical fascia forms pulleys for what two things?
Forms pulleys for intermediate tendons of digastric & omohyoid
Continuous superiorly as buccopharyngeal fascia of pharynx
muscular vs visceral portion of pretrachial deep cervical fascia? ( thin vs thick, what does each surround? )
Muscular portion-thin, surrounds infrahyoid muscles
Visceral portion-thick, surrounds thyroid, trachea, & esophagus
what fascia layer is Continuous superiorly as buccopharyngeal fascia of pharynx?
pretracheal deep cervical fascia
what is the clinical significance of the buccopharyngeal fascia?
buccopharyngeal fascia that invests posterior wall of pharynx. BEHIND that is potential space: where pharyngeal infections can rapidly spread superior or inferiorly “retropharyngeal space”
prevertebral deep cervical fascia surrounds what structures?
Surrounds vertebral column & associated muscles
the carotid sheath is formed by which layers of the cervical fascia? from where to where does it extend?
Formed from all 3 deep sheaths
Extends from cranial base to root of neck
what does the carotid sheath contain? (5)
Common, external, & internal carotids
Vagus (CN X)
Nerve to carotid sinus
Carotid arterial plexuses (postganglionic sympathetic neurons)