Muscle Chart 3 Flashcards
Sternocleidomastoid–Sternal Head
O: Upper part of anterior surface of manubrium of sernum
I: Lateral one-half of superior nuchal line
Individually–will tilt head toward shoulder on same side rotating head to turn face to opposite side; acting together, draw head forward.
Sternocleidomastoid–Clavicular Head
O: Superior surface of medial 1/3 of clavicle
I: Lateral surface of mastoid process
Posterior Scalene
O: Posterior tubercles of vertebrae C4 to C6
I: Upper surface of rib 2
Elevation of rib 2.
Middle Scalene
O: Transverse processes of vertebrae C2 to C7.
I: Upper surface of rib 1 posterior to the groove for the subclavian artery
Elevation of rib 1.
Anterior Scalene
O: Anterior tubercles of the transverse processes of vertebrae C3 to C6
I: Scalene tubercle and upper surface of rib 1.
Elevation of rib 1.
Stylohyoid
O: Base of styloid process
I: Lateral area of body of hyoid bone.
Pulls hyoid bone upward in a posterosuperior direction.
Digastric–Anterior Belly
O: Digastric fossa on lower inside of mandible
I: Attahment of tendon between two bellies to body of hyoid bone.
Opens mouth by lower mandible; raises hyoid bone
Digastric–Posterior Belly
O: Mastoid notch on medial side of mastoid process of temporal bone.
I: Same as anterior belly
Pulls hyoid bone upward and back.
Mylohyoid
O: Mylohyoid line on mandible
I: Body of hyoid bone and fibers from muscle on opposite side.
Support and elevation of floor of mouth; elevation of hyoid.
Geniohyoid
O: Inferior mental spine on inner surface of mandible
I: Anterior surface of body of hyoid bone.
Fixed mandible elevates and pulls hyoid bone forward; fixed hyoid bone pulls mandible downward and inward.
Sternohyoid
O: Posterior aspect of sternoclavicular joint and adjacent manubrium of sternum.
I: Body of hyoid bone medial to attachment of omohyoid muscle
Depresses hyoid bone after swallowing.
Omohyoid
O: Superior border of scapula medial to suprascapular notch.
I: Lower border of body of hyoid bone just lateral to attachment of sternohyoid.
Depresses and fixes hyoid bone.
Thyrohyoid
O: Oblique line on lamina of thyroid cartilage
I: Greater horn and adjacent aspect of body of hyoid bone.
Depresses hyoid bone, but when hyoid bone is fixed raises larynx.
Sternothyroid
O: Posterior surface of manubrium of sternum.
I: Oblique line on lamina of thyroid cartilage.
Draws larynx (thyroid cartilage) downward.
