NEQUE Flashcards
(20 cards)
Which of the suprahyoid and infrahyoid muscles are the odd ones out in terms of innervation, and what are they innervated by?
Suprahyoid muscle:
Geniohyoid - supplied by C1 of hypoglossal nerve
Infrahyoid:
Thyrohyoid - supplied by C1 of hypoglossal nerve
What is the innervation of the posterior aspect of the digastric and which other muscle does this nerve supply?
Facial nerve = posterior belly
Stylohoid - also supplied by facial nerve
What is the innervation of the anterior aspect of the digastric and which other muscle does this nerve supply?
V3 - anterior belly
Mylohyoid - also supplied by V3 of trigeminal
What the attachments of the mylohyoid?
Body of mandible and hyoid
sheet like muscle
What are the two functions of the mylohyoid?
Elevates hyoid
Retracts hyoid
Elongates floor of mouth
Supports floor of oral cavity
(sheet like)
What are the attachments of the geniohyoid?
Inferior mental spine of mandible
Body of hyoid
What is the function of the geniohyoid?
Protracts hyoid
Depresses mandible
What are the attachments of the stylohyoid muscle?
Styloid process
Body of hyoid bone
What is the function of the stylohyoid muscle?
Retracts hyoid
Elevates hyoid
What are the attachments of the digastric?
Anterior belly: Internal aspect of mandible via a tendon attached to the hyoid
Posterior belly:
Mastoid process to tendon on hyoid
What is the function of the ANTERIOR belly of the digastric muscle?
Depresses the mandible
Elevates and protracts the hyoid
What is the function of the POSTERIOR belly of the digastric muscle?
Retracts the hyoid
(also) elevates the hyoid
What innervates 3 of the infrahyoid muscles and which muscles are these?
Omohyoid
Sternohyoid
Sternothyroid
Supplied by Ansa cervicalis (anterior rami of C1 to C10)
What is the attachment of the thyrohyoid?
Thyroid cartilage
Greater horn of hyoid
Function of thyrohyoid?
Depresses hyoid
ELEVATES LARYNX
What is the attachment of the omohyoid?
Superior border of scapula
Body of hyoid
Function of omohyoid?
Depresses hyoid
What are the attachments of the sternothyroid?
Posterior surface of manubrium
Thyroid cartilage
Function of sternothyroid?
Depression of larynx
When the two bellies of the digastric work in conjunction, what action do they help with?
They help the lateral pterygoids to open the mouth by depressing the mandible
