A&P Chapter 10 Mucles only

Origin: zygomatic bone Insertion: skin and muscle at corner of lips Action: raises corner of mouth

Origin: Maxilla and mandible Insertion: Lips Action: Compresses, purses lips

prime mover of jaw closure (elevates mandible)

• nerve: trigeminal nerve

constrict pharynx during swallowing (propels food down esophagus)

flexes, and laterally rotates head

• nerve: accessory

extends head

• spinal extender

• from neck to sacrum

prime mover of inspiration

• flattens on constriction

• 3 holes for the esophagus

• nerve: phrenic nerve

flexes and rotates lumbar region of vertebral column

scapula mover - adduction (pulling up)

• nerve: accessory nerve

fixators of the scapula *minor on top, major on bottom

supraspinatus, infraspinatus, teres minor, subscapularis

adducts and medially rotates arm

• I: greater tubercle of humerus

rowing muscle

Prime mover of arm abduction

• 2 origins

• prime mover of forearm flex

• synergist for forearm supination

3 origins

• prime mover of forearm extension

Flexes and abducts hand

• O: epicondyle of humerus

• I: thumb side of hand

wrist extenders

prime mover for finger extension

powerful knee flexors cross the knee and hip joint prime movers-flexion biceps femoris semitendinosus semimembranosus

prime mover of dorsiflexion and foot inversion

Calf muscle O: behind the knee I: into back of calcaneus (achilles tendon)

thumb mover

Rectus femoris Vastus lateralis and medialis Vastus intermedius

protract mandible and side-side grinding movements of teeth

• nerve: trigeminal nerve

protract mandible and side-side grinding movements of teeth

• nerve: trigeminal nerve

Occipitalis (occipital belly) Origin: occipital and temporal bones Insertion: epicranial aponeurosis

Raises eyebrows Frontal belly Eyebrow and forehead mover Pulls scalp posteriorly

Origin: epicranial aponeurosis Insertion: skin of eyebrows and root of nose Epicranial aponeurosis Aponeurosis - sheet like tendon

flex and adduct hand

• O: epicondyle of humerus

• I: pinky side of hand

moves fingers (not thumb) *flexor compartment

allows arm pronation *flexor compartment

piece of tape that wraps tendons around wrist

a passageway in the wrist that tendons and nerves pass through

prime movers for leg adduction

flex and adduct thigh

synergist for hip adduction and flexion

• sciatic nerve

• rectus femoris antagonist

• sciatic nerve pops and splits at the popliteal fossa

prime mover of plantar flexion