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Muscles of Anterior Neck

Terms in this set (52)

Origin of Platysma
inferior border of mandible, skin and subcutaneous tissue of the lower face
Insertion of Platysma
fascia covering superior parts of pectoralis major and deltoid muscles
Innervation of Platysma
cervical branch of facial nerve (CN VII)
Action of Platysma
-draws the corner of mouth inferiorly and widens it (sadness and fright)
-draws skin of neck superiorly when teeth are clenched
Origin of Sternohyoid
manubrium of sternum and medial end of clavicle
Insertion of Sternohyoid
body of hyoid
Innervation of Sternohyoid
C1-C3 by a branch of ansa cervicalis
Action of Sternohyoid
depresses hyoid after elevation during swallowing
Origin of Omohyoid
superior border of scapula near the suprascapular notch
Insertion of Omohyoid
inferior border of hyoid
Innervation of Omohyoid
C1-C3 by a branch of ansa cervicalis
Action of Omohyoid
depresses, retracts, and steadies the hyoid
Origin of Sternothyroid
posterior surface of manubrium of the sternum
Insertion of Sternothyroid
oblique line of thyroid cartilage
Innervation of Sternothyroid
C2 and C3 by a branch of ansa cervicalis
Action of Sternothyroid
depress hyoid and larynx
Origin of Thyrohyoid
oblique line of thyroid cartilage
Insertion of Thyrohyoid
inferior body and greater horn of the hyoid
Innervation of Thyrohyoid
C1 via hypoglossal nerve (CN XII)
Action of Thyrohyoid
depresses hyoid and elevates larynx
Origin of Anterior Digastric
digastric fossa of mandible
Insertion of Anterior Digastric
intermediate tendon to body and greater horn of hyoid bone
Innervation of Anterior Digastric
nerve to mylohyoid, a branch on inferior alveolar nerve
Action of Anterior Digastric
Working with infrahyoid muscles:
-depresses mandible against resistance
-elevates and steadies hyoid during swallowing and speaking
Origin of Posterior Digastric
mastoid notch of temporal bone
Insertion of Posterior Digastric
intermediate tendon to body and greater horn of the hyoid bone
Innervation of Posterior Digastric
digastric branch of facial nerve (CN VII)
Action of Posterior Digastric
Working with infrahyoid muscles:
-depresses mandible against resistance
-elevates and steadies hyoid during swallowing and speaking
Origin of Mylohyoid
mylohyoid line of mandible
Insertion of Mylohyoid
mylohyoid raphe and body of hyoid
Innervation of Mylohyoid
nerve to mylohyoid, a branch of inferior alveolar nerve (from mandibular nerve, CN V3)
Action of Mylohyoid
elevates hyoid, floor of mouth, and tongue during speaking and swallowing
Origin of Stylohyoid
styloid process of temporal bone
Insertion of Stylohyoid
body of hyoid
Innervation of Stylohyoid
stylohyoid branch of facial nerve (CN VII)
Action of Stylohyoid
elevates and retracts hyoid, thus elongating floor of mouth
Origin of Sternocleidomastoid
mastoid process of temporal bone and lateral half of superior nuchal line
Insertion of Sternocleidomastoid
-Sternal Head: manubrium of sternum
-Clavicular Head: medial third of clavicle
Innervation of Sternocleidomastoid
-spinal accessory nerve (CN XI, motor)
-C2 and C3 nerves (pain and proprioception)
Action of Sternocleidomastoid
-Unilaterally: ipsilat laterally bends and contralat rotates head and neck
-Bilaterally: protrudes head and neck
-elevates sternum during forceful inspiration
Origin of Anterior Scalene
transverse processes of C3-C6 vertebrae
Insertion of Anterior Scalene
1st rib
Innervation of Anterior Scalene
ventral rami C4-C6 spinal nerves
Action of Anterior Scalene
-laterally flex head and neck to same side
-elevate first rib during forced inspiration
Origin of Middle Scalene
posterior tubercles of transverse processes of C2-C7 vertebrae
Insertion of Middle Scalene
1st rib
Innervation of Middle Scalene
ventral rami C3-C8 spinal nerves
Action of Middle Scalene
-laterally flex head and neck to same side
-elevate first rib during forced inspiration
Origin of Posterior Scalene
posterior tubercles of transverse processes of C2-C7 vertebrae
Insertion of Posterior Scalene
external border of 2nd rib
Innervation of Posterior Scalene
ventral rami C7-C8 spinal nerves
Action of Posterior Scalene
-laterally flex head and neck
-elevate 2nd rib during forced inspiration
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