Head, Neck, Torso Muscles Mwh

Front 1

Pectoralis Major

Back 1

Originates at the clavical & sternum and inserts at the humerous: Flexes the arm (shoulder to elbow)

Front 2

Deltoid

Back 2

Triangular Shaped. Acromial and clavical to deltoid tuberosity. Responsible for abduction of the arm. Moves arm away from body.

Front 3

Pectoralis Minor

Back 3

Deep Muscle, lies beneath Pectoralis Major. Originates at lower rib and inserts at the front of scapula. Responsible for rolling shoulders forward.

Front 4

Serratus Anterior

Back 4

Deep, inferior to pectroalis minor. Originates at lower rib. Inserts in front of scapula. Helps pectoralis minor in rolling shoulders forward.

Front 5

External Intercostals

Back 5

Between Ribs: superficial pull up on rib cage for respiration

Front 6

Internal Intercostals

Back 6

Between ribs. Involved in forced expiration

Front 7

Trapezius

Back 7

Originates off of occipital bone and spinous process of cervical vertabrae. Function is to extend head and elevate shoulders: shrug

Front 8

Latisimmus Dorsi

Back 8

Originates at the spinous process and inserts at humerous. Pulls arms back as if rowing

Front 9

Suprispinatus

Back 9

works with deltoid for abduction of arm. Pulls away from midline of the body.

Front 10

Teres Major

Back 10

Originates at border of scapula and inserts on medial/anterior humerus. Draws arm toward the body. ADDUCTION

Front 11

Teres Minor

Back 11

Sliver of muscle sandwiched between infraspinatus and Teres Major. Responsible for lateral rotation of the arm/humerus

Front 12

Levator Scapulae

Back 12

Transverse process C1-4 inserts superior medial border of scapula. Responsible for elevating scapula.

Front 13

Rhomboids

Back 13

Spinous process of t2-t5 inserts at medial border of scapula, pulls in on medial border of scapula and rotates Medially and Inferiorally

Front 14

Rectus Abdominis

Back 14

Parallel muscles originate at pelvic girdle and up towards xiphoid process. Flexes the vertebral column

Front 15

External Obliques

Back 15

Muscle Fibers running at angle, lateral to pelvic girdle, responsible for trunk rotation.

Front 16

Internal Oblique

Back 16

Deep to External Oblique, assists with trunk rotation.

Front 17

Fronalis

Back 17

Overlays frontal bone, raises eyebrows and wrinkles forehead

Front 18

occipitalis

Back 18

Overlies the occipital bone and pulls scalp posteriorly

Front 19

temporalis

Back 19

lies deep, very large, runs down into mandible. Responsible for pulling up/elevating the mandible for chewing

Front 20

Masseter

Back 20

sits in front of ear. Responsible for mastication, pulling up on mandible

Front 21

Buccinator

Back 21

originates on the mandible and maxilla. Inserts self on obicularis oris. Compresses cheeks...whistling

Front 22

Zygomaticus

Back 22

2 Muscles: Major and Minor. Originate on zygomatic bone
Pulls up on corners of mouth...Smiling

Front 23

Depressor angulioris

Back 23

Pulls down on corners of mouth. Frowning. Is antagonist to zygomaticus.

Front 24

Orbicularis Oris

Back 24

Surrounds the mouth and lips. Round muscle. Called the kissing muscle. Puckers lips

Front 25

Orbicularis oculi

Back 25

Surrounds the eyes. Round Muscle. Responsible for blinking, squinting, closing eyes.

Front 26

Risorius

Back 26

Lies over Buccinator. Pulls corners of mouth laterally...tenses lips.

Front 27

Mentalis

Back 27

point of chin. turns up bottom lip. Protrudes the pouting muscle

Front 28

Sternocleidomastoid

Back 28

Powerful and large muscle. Bilateral.
Individual: Turns head to opposite shoulder.
Unison: flexes neck

Front 29

digastric

Back 29

raises the hyoid bone for swallowing. Is 2 parts. Posterior off the mastoid process to hyoid bone

Front 30

mylohyoid

Back 30

works with digastric to aid in swallowing.

Front 31

sternohyoid

Back 31

originates of manubrium attaches to bottom of hyoid. Opposite to mylohyoid. Depresses the hyoid to aid in swallowing.

Front 32

omohyoid

Back 32

originates off the scapula. inserts on lower hyoid. Works with sternohyoid to depress hyoid and aid in swallowing.