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Muscular System 1 Cheat Sheet by

muscle functions and where to find

Muscles of scalp, face and neck

Occipi­talis
pulls scalp poster­iorly (occipital and temporal bone)
Frontalis
elevates eyebrows (epicr­anial aponeu­rosis)
Temporalis
closes jaw (zygomatic bone)
Buccinator
compress cheeks (alveolar process of maxill­a/m­and­ible)
Mentalis
Elevates lower lip (incisive fossa of mandible)
Orbicu­laris Oculi
closes eyes (orbit)
Orbicu­laris oris
Purses lips (mandible)
Levator labii superioris
Elevates upper lips (inferior margin of orbit)
Masseter
closes jaw (zygomatic arch)
Zygoma­ticus major
retracts and elevates corners of mouth (zygomatic bone)
Sterno­cle­idm­astoid
Together: Flex neck. Alone:­turns face to opposite side (sternal end of clavicle and manubrium)
Digastric
depressed mandible (inferior surface of mandib­le/­tem­poral bone)
Platysma
depresses mandible (acromion of scapula)
Depressor labii inferioris
depresses lower lip (mandible)
Mylohyoid
elevates hyoid bone (mandible)

Muscles of the arm

Coraco­bra­chialis
flexion and abduction of arm (coracoid process of scapula)
Biceps brachii
flexion of forearm
Triceps brachii
forearm extension
Brachi­ora­dialis
forearm flexion
Brachialis
flexes forearm

Muscles of anterior leg

Tibialis anterior
prime mover of dorsif­lexion

Leg and forearm

Extensor digitorum
extends fingers
Extensor digitorum
extends toes

Leg and forearm

Extensor digitorum
extends fingers
Extensor digitorum
extends toes
 

Superf­icial muscles of thorax and back

Pectoralis major
prime mover of arm flexion (sternal end of clavicle)
Pectoralis minor
Protracts and rotates scapula downward (ribs 3-5)
Trapezius
Stabil­izes, elevates, and rotates scapula (occipital bone)

Deep muscles of the thorax and back

Internal interc­ostal
depression of rib cage (superior border of rib cage)
External interc­ostal
elevation of rib cage (inferior border of rib cage)
Diaphragm
prime mover of inspir­ation (inferior surface of rib cage)
Serratus anterior
rotates scapula upward (anterior surface of scapula)
Rhomboids
stabilizes scapula (spinous process of C7 and T1)

Muscles of the abdominal region

Rectus abdominus
Flex and rotates lumbar region of vertebral column
Internal oblique
compress abdominal wall
External oblique
compress abdominal wall

Muscles crossing the shoulder joint

Subsca­pularis
medial rotation of arm
Latissimus dorsi
prime mover of arm extension
Supras­pinatus
Initiates abduction of arm (near traps)
Infras­pinatus
laterally rotates arm (scapula)
Teres major
extends and medially rotates and adducts arm
Deltoid
prime mover of arm abduction (acromion and spine of scapula)

Muscles of posterior leg

Gastro­cnemius
Plantar flexion of foot
Soleus
Plantar flexion of foot (deep)
 

Muscles of the forearm

Pronator teres
pronates forearm (medial epicondyle of humerus)
Palmaris longus
tenses skin of palm during hand movement (medial epicondyle of humerus)
Flexor carpi radialis
flexion of hand
Flexor carpi ulnaris
Flexes and adducts hand
Extensor carpi radialis longus
extends hand
Extensor carpi radialis brevis
extends and abducts hand
Extensor carpi ulnaris
extends hand
Adductor pollicis
adducts and helps oppose the thumb
Extensor pollicis brevis
Extends thumb

Muscles of anterior thigh

Sartorius
flexes and abducts thigh
Pectineus
Adducts and medially rotates thigh
Adductor longus
Adducts and medially rotates thigh
Adductor magnus
Adducts and medially rotate and flexes thigh
Gracilis
adducts thigh, flexes and medially rotates the leg
Rectus femoris
extends leg and flexes thigh
Vastus lateralis
extends leg and stabilizes knee
Vastus interm­edius
extends leg
vastus medialis
extends leg

Muscles of the posterior thigh

Gluteus maximus
extends thigh
Gluteus medius
abducts and medially rotates thigh
Biceps femoris
Extends thigh and flexes leg
Semite­ndi­nosus
extends thigh and flexes leg
Semime­mbr­anosus
extends thigh and flexes leg
 

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