ENT 4SE external neck anatomy Flashcards
superior boundary of the neck (MME)
inferior border of Mandible; tip of Mastoid process; External occipital protruberance
lateral boundary of the neck (ST)
SCM; trapezius
medial boundary of the neck (H C TH TH)
hyoid; thyroid cartilage; cricoid cartilage; thyroid gland
three cervical fascias and other names
superficial / superior; middle / pre-tracheal; deep / pre-vertebral cervical fascia
encased by superficial CF
SCM and trapezius muscles
encased by middle CF
infrahyoid muscles
encased by deep CF
deep neck muscles
contents of neurovascular sheath
carotid artery; internal jugular vein; vagus nerve
which neck space is connected to the mediastinum
space b/w MIDDLE and DEEP layers (allows spread of disease / abscess)
CCA becomes ECA and ICA at what level
superior border of thyroid cartilage (C4)
what artery supplies neck and face
external carotid artery from CCA
what artery supplies lower part of face
thyrocervical trunk from subclavian artery
describe venous drainage
superficial cutaneous veins drain to subclavian and IJV
what veins handle 30% of cerebral venous return
vertebral veins and venous plexus
has mechanoreceptors
carotid SINUS (respond to vessel wall tension)
has chemoreceptors
carotid BODY (respond to pO2, pCO2, and pH changes)
what are the 2 jugular venous junctions
juguloFACIAL and juguloSUBCLAVIAN venous junctions
lymphatic drainage
at the junction of subclavian and IJV; at the termination of THORACIC DUCT
sensory innervation
cervical plexus (C1-C4)
what is ERB’S POINT?
posterior border of SCM where cervical plexus (C1-C4) emerges
ANSA CERVICALIS supplies what muscles
infrahyoid and geniohyoid muscles
CN 9 10 and 11 exit through what foramen
JUGULAR foramen
sensory innervation of MIDDLE EAR mucosa and EUSTACHIAN TUBE
tymapnic nerve (from inferior ganglion of CN 9)
what forms the lesser petrosal nerve
unity of TYMPANIC NERVE, intermediate nerve of facial nerve, and sympathetic fibers of internal cervical plexus
