The Hyoid Bone, Strap Muscles of the Neck and Cervical Plexus Flashcards
label the parts of the hyoid bone
what is the only bone in the body that doesnt articulate with another bone called?
hyoid bone
name the muscles/sets of muscles attached to the hyoid bone
- suprahyoid muscles
- infrahyoid muscles
- hypoglossus (muscle of tongue)
- middle pharyngeal constrictor (muscle of pharynx)
list the suprahyoid muscles
hint: Mad Girls Die Stylish
- mylohyoid
- geniohyoid
- digastric
- stylohyoid
what is the nerve supply of the mylohyoid muscle?
- inferior alveolar nerve > a branch of V3
what is the nerve supply of the geniohyoid muscle?
C1 nerve roots that run within the hypoglossal nerve (XII)
what is the nerve supply of the digastric muscle?
anterior belly > inferior alveolar nerve (branch of V3)
posterior belly > facial nerve (VII)
what is the nerve supply of the stylohyoid muscle?
facial nerve (VII)
what action do the suprahyoid muscles have on the mandible and hyoid bone?
- elevate the hyoid bone
- involved in swallowing
list the infrahyoid muscles
(HINT: stop saying that olivia)
sternohyoid
sternothyroid
thyrohyoid
omohyoid
what is the nerve supply of the infrahyoid muscles
- all from anterior rami of C1-3, carried by a branch of the ansa cervalis.
- EXCEPT for thyrohyoid which is innervated by C1 which reaches it by hitching a ride on the hypoglossal nerve.
what action do the infrahyoid muscles have on the hyoid bone and larynx
- depression of hyoid.
- sternothyroid depresses the larynx whereas the thyrohyoid elevates it.
- the omohyoid pulls the carotid sheath.
label the suprahyoid and infrahyoid muscles
what are the vertebral root values of the cervical plexus?
anterior rami of cervical spinal nerves C1-4
name a motor nerve that emerges from the cervical plexus and travels down through the thorax
phrenic nerve (C3-5) to provide motor innervation to the diaphragm
