Anatomy - MOINA of the Neck

origin of platysma

deep fascia over pectoralis major and deltoid

insertion of platysma

body of mandible and angle of mouth

innervation of platysma

facial nerve (cervical branch)

action of platysma

depresses mandible and angle of mouth

origin of sternocleidomastoid

manubrium sterni and medial third of clavicle

insertion of sternocleidomastoid

mastoid process of temporal bone and occipital bone

innervation of sternocleidomastoid

spinal part of accessory nerve, and C2 and 3

action of sternocleidomastoid

• two muscles acting together extend head and flex neck

• one muscle rotates head to opposite side

origin of digastric (posterior belly)

mastoid process of temporal bone

insertion of digastric (posterior belly)

intermediate tendon is held to hyoid by fascial sling

innervation of digastric (posterior belly)

facial nerve

action of digastric (posterior belly)

depresses mandible or elevates hyoid bone

origin of digastric (anterior belly)

body of mandible

insertion of digastric (anterior belly)

intermediate tendon is held to hyoid by fascial sling

innervation of digastric (anterior belly)

nerve to mylohyoid

action of digastric (anterior belly)

depresses mandible or elevates hyoid bone

origin of stylohyoid

styloid process

insertion of stylohyoid

body of hyoid bone

innervation of stylohyoid

facial nerve

action of stylohyoid

elevates hyoid bone

origin of mylohyoid

mylohyoid line of body of mandible

insertion of mylohyoid

body of hyoid bone and fibrous raphe

innervation of mylohyoid

inferior alveolar nerve

action of mylohyoid

elevates floor of mouth and hyoid bone or depresses mandible

origin of geniohyoid

inferior mental spine of mandible

insertion of geniohyoid

body of hyoid bone

innervation of geniohyoid

first cervical nerve

action of geniohyoid

elevates hyoid bone or depresses mandible

origin of sternohyoid

manubrium sterni and clavicle

insertion of sternohyoid

body of hyoid bone

innervation of sternohyoid

ansa cervicalis; C1, 2, and 3

action of sternohyoid

depresses hyoid bone

origin of sternothyroid

manubrium sterni

insertion of sternothyroid

oblique line on lamina of thyroid cartilage

innervation of sternothyroid

ansa cervicalis; C1, 2, and 3

action of sternothyroid

depresses larynx

origin of thyrohyoid

oblique line on lamina of thyroid cartilage

insertion of sternothyroid

lower border of body of hyoid bone

innervation of sternothyroid

first cervical nerve

action of sternothyroid

depresses hyoid bone or elevates larynx

origin of omohyoid (inferior belly)

upper margin of scapula and suprascapular ligament

insertion of omohyoid (inferior belly)

intermediate tendon is held to clavicle and first rib by fascial sling

innervation of of omohyoid (inferior belly)

ansa cervicalis; C1, 2, and 3

action of omohyoid (inferior belly)

depresses hyoid bone

origin of omohyoid (superior belly)

lower border of body of hyoid bone

insertion of omohyoid (superior belly)

intermediate tendon is held to clavicle and first rib by fascial sling

innervation of omohyoid (superior belly)

ansa cervicalis; C1, 2, and 3

action of omohyoid (superior belly)

depresses hyoid bone

origin of scalenus anterior

transverse processes of third, fourth, fifth, and sixth cervical vertebrae

insertion of scalenus anterior

first rib

innervation of scalenus anterior

C4, 5, and 6

action of scalenus anterior

• elevates first rib

• laterally flexes and rotates cervical part of vertebral column

origin of scalenus medius

transverse processes of upper six cervical vertebrae

insertion of scalenus medius

first rib

innervation of scalenus medius

anterior rami of cervical nerves

action of scalenus medius

• elevates first rib

• laterally flexes and rotates cervical part of vertebral column

origin of scalenus posterior

transverse processes of lower cervical vertebrae

insertion of scalenus posterior

second rib

innervation of scalenus posterior

anterior rami of cervical nerves

action of scalenus posterior

• elevates second rib

• laterally flexes and rotates cervical part of vertebral column