muscle origin, insertion, action Flashcards
orbicularis oculi action
closes eye, draws eyebrows inferiorly
orbicularis oris action
closes lips, purses and protrudes lips
zygomaticus major action
raises lateral corners of mouth upwards
buccinator action
compresses cheek
masseter action
elevates mandible
frontalis action
raises eyebrows, fixes aponeurosis and pulls scalp posteriorly
temporalis action
elevates and retracts mandible
scalenes action
elevate ribs 1-2
sternocleidomastoid action
flexion of neck, rotate head toward shoulder
external intercostals action
pulls ribs toward one another to elevate rib cage
Internal intercostals action
Draws ribs together to depress rib cage
Diaphragm
Prime mover of inspiration flattens on contraction
Pectoralis major
Prime mover of arm flexion; addicts, medially rotates arm
Serratus anterior
Prime mover to protract and hold scapula against chest wall; rotates scapula
Trapezius
Raises, rotates, and addicts scapula and stabilizes it
Rhomboid major
Stabilizes scapulae
Latissimus dorsi
Prime mover of arm extension
External oblique
Flexes the vertebral column, compresses abdominal wall, trunk rotation and lateral flexion
Internal oblique
Flexes the vertebral column compresses abdominal wall, trunk rotation, and lateral flexion
Transverse abdominis
Compresses abdominal contents
Rectus abdominis
Flexes the vertebral column
Deltoid
Prime mover of arm abduction
Biceps brachii
Flexion and supination of forearm
Triceps brachii
Powerful forearm extensor
Flexor carpi radialis
Powerful flexor and abductor of the hand
Flexor carpi ulnaris
Flexes and adducts hand
Palmaris longus
Tenses skin und fascia of palm
Extensor carpi radialis
Extends and abducts hand
Extensor carpi ulnaris
Extends and adducts hand
Gluteus Maximus
Powerful thigh extension
Tensor fascia latea
Flexes, abducts, and medically rotates thigh,
Gracilis
Adducts thigh; flexes and medially rotates leg
Sartorious
Flexes, abducts, and laterally rotates thigh; flexes leg
Biceps femurs
Extends thigh; flexes leg
Semitendinosus
Extends thigh; flexes leg
Semimembranosus
Extends thigh; flexes leg
Rectus femoris
Extends leg and flexes thigh
Vastus lateralis
Extends leg and stabilizes knee
Vastus medialis
Extends leg; stabilizes patella
Vastas intermedium
Extends leg
Tibialis anterior
Prime mover of dorsiflexion
Extensor digitorum longus
Prime mover of toe extension
Gastrocnemius
Plantar flexes foot
Soleus
Plantar flexion
Fibularis (peroneus) longus
Plantar flexes and everts foot
extensor digitorum
Prime mover of finger extension