Anterior Triangle of Neck Flashcards
What are the boundaries of the anterior triangle of the neck?
Anterior: midline of the neck
Posterior: anterior border of the sternocleidomastoid
Superior: Mandible
what are the 4 infrahyoid muscles?
omohyoid
sternohyoid
thyrohyoid
sternothyroid
what is the innervation of the sternohyoid
ansa cervicalis (C1-C3)
what is the innervation of the sternothyroid
ansa cervicalis (C1-C3)
what is the innervation of the thyrohyoid?
C1 fibers via hypoglossal nerve
what fibers make up the ansa cervicalis?
fibers from C1- to C3
what does the ansa cervicalis supply?
both bellies of omohyoid
sternohyoid
sternothyroid
thyrohyoid + geniohyoid
what is the innervation of the posterior and anterior belly of the digastric muscles?
posterior- facial nerve
anterior- nerve to mylohyoid
what are the suprahyoid muscles?
digastric
stylohyoid
mylohyoid
geniohyoid
what innervates the stylohyoid?
facial nerve
what innervates the mylohyoid?
nerve to the mylohyoid
what innervates the geniohyoid?
C1 fibers
what are the anterior vertebral muscles?
longus capitis
longus colli
rectus capitis anterior
rectus capitis lateralis
what is the innervation of the longus capitis?
ventral rami of C1 to C3
what is the innervation of the longus colli?
ventral rami of C2 to C6
what is the innervation of the rectus capitis anterior and lateralis?
: ventral rami of C1 and C2
what are the 3 parts of the longus colli?
inferior oblique
superior oblique
vertical
what makes up the boundaries of the submandibular triangle?
posterior belly of digastric + stylohyoid
anterior belly of digastric
inferior border of mandible
floor- mylohyoid
what are the contents of the submandibular triangle?
Submandibular gland Facial vessels (A + V) Submandibular lymph nodes Hypoglossal nerve Mylohyoid nerve and vessels (A + V
what are the boundaries of the carotid triangle?
anterior border of sternocleidomastoid
posterior belly of digastric
superior belly of omohyoid
what runs through the carotid triangle?
Common carotid Initial segments of external and internal carotid Some branches of external carotid Internal jugular + some tributaries Vagus Accessory Hypoglossal Ansa cervicalis Internal and external laryngeal nerves Deep cervical lymph nodes
what are the boundaries of the muscular triangle of the neck?
anterior midline of the neck
superior belly of omohyoid
anterior border of sternocleidomastoid
what runs through the muscular triangle?
sternohyoid
sternothyroid
what are the boundaries of the submental triangle?
both anterior bellies of digastric muscles
hyoid bone
floor- mylohyoid muscle
What is the action of the sternohyoid m.?
Depresses hyoid bone
What is the action of the sternothyroid m.?
Depresses larynx
What is the action of the thyrohyoid?
Depresses hyoid bone or elevates the larynx
What is the action of the digastric muscle?
Depresses the mandible or elevates hyoid bone
What is the action of the stylohyoid m.?
Lifts up the hyoid bone and draws it backwards
What is the action of the mylohyoid?
Elevates the floor of the mouth, depresses the mandible, and elevates the hyoid bone
What is the action of the geniohyoid?
Elevates the hyoid bone and draws it forward
What is the action of the longus capitis?
Flexion of head and neck
What is the action of the longus colli?
Flexion of the neck
What is the action of the rectus capitis anterior?
Flexion of the head
What is the action of the rectus capitis lateralis?
Lateral flexion of head to one side
