MOINA of the Neck Flashcards
platysma
origin: deep fascia of pectoralis major and deltoid
insertion: body of mandible and angle of mouth
nerve: facial nerve - cervical branch
depresses mandible and angle of mouth
sternocleidomastoid
origin: manubrium sterni and medial third of clavicle
insertion: mastoid process of temporal bone and occipital bone
nerve: spinal part of accessory nerve and C2 and 3
two muscles act together to flex and extend the neck; one muscle rotates head to opposite side
digastric posterior belly
origin: mastoid process of temporal bone
insertion: intermediate tendon is held to hyoid by fascial sling
nerve: facial nerve
depresses mandible or elevates hyoid bone
digastric anterior belly
origin: body of mandible
insertion: intermediate tendon is held to hyoid by fascial sling
nerve: nerve to mylohyoid
depresses mandible and elevates hyoid bone
stylohyoid
origin: styloid process
insertion: body of hyoid bone
nerve: facial nerve
elevates hyoid bone
mylohyoid
origin: mylohoid line of body of mandible
insertion: body of hyoid bone and fibrous raphe
nerve: inferior alveolar nerve
elevates floor of mouth and hyoid bone or depresses mandible
geniohyoid
origin: inferior mental spine of mandible
insertion: body of hyoid bone
nerve: first cervical nerve
elevates hyoid bone or depresses mandible
sternohyoid
origin: manubrium sterni and clavicle
insertion: body of mandible
nerve: ansa cervicalis, C1, 2, and 3
depresses hyoid bone
sternothyroid
origin: manubrium sterni
insertion: oblique line on lamina of thyroid cartilage
nerve: ansa cervicalis; C1, 2, and 3
depresses larynx
thyrohyoid
origin: oblique line of lamina on thryoid cartilage
insertion: lower border of body of mandible
nerve: first cervical nerve
depresses hyoid bone; elevates larynx
omohyoid inferior belly
origin: upper margin of scapular and suprascapular ligament
insertion: intermediate tendon is held to clavicle and first rib by fascial sling
nerve: ansa cervicalis; C1, 2, and 3
depresses hyoid bone
omohyoid superior belly
origin: lower border of body of hyoid bone
insertion: intermediate tendon is held to clavicle and first rib by fascial sliing
nerve: ansa cervicalis; C1, 2, and 3
depresses hyoid bone
scalenus anterior
origin: transverse process of third, fourth, fifth, and sixth cervical vertebrae
insertion: first rib
nerve: C4, 5, and 6
elevates first rib; laterally flexes and rotates cervical part of vertebral column
scalenus medius
origin: transverse processes of upper six cervical vertebrae
insertion: first rib
nerve: anterior rami of cervical nerves
elevates first rib; laterally flexes and rotates cervical part of vertebral column
scalenus posterior
origin: transverse processes of lower cervical vertebrae
insertion: second rib
nerve: anterior rami of cervical nerves
elevates second rib; laterally flexes and rotates cervical part of vertebral column
