Musc syst 2

MUSCLE	ORIGIN	INSERTION	ACTION
SUPRASPINATUS (above spinous scapula)	Supraspinous fossa scapula	Superior humerus (greater tubercle)	Abduction of arm
INFRASPINATUS (below spinous scapula)	Infraspinous fossa scapula	Superior lateral humerus (gr. Tubercle)	Lateral rotation of arm
TERES MINOR (Minor role in rotator cuff)	Scapula	Lateral humerus	Lateral rotation of arm
TERES MAJOR (has its own movements, not part of the rotator cuff)	scapula	Anterior lateral humerus	Extension and adduction of the arm
LATISSIMUS DORSI Lats (gym workout), works down to the posterior pelvis, rowing muscle	Spines of vertebraeT7-L5 sacrum, ilium	Medial humerus	Extension and adduction of the arm
DELTOID Shoulder muscle	Clavicle and scapula (spine)	Humerus (deltoid tuberosity)	Abduction, flexion, extension and medial and lateral rotation of arm
SUBSCAPULARIS (anterior muscle)	Anterior scapula	Proximal med humerus (lesser tubercle)	Rotates arm medially at shoulder joint

Rotator cuff muscles (SITS) that stabilize the shoulder joint are supraspinatus, infraspinatus, teres minor and subscapularis (anterior).

Rotator Cuff Muscles - All 4 help reinforce the joint capsule

Muscles That Move the Verterbral Column – maintain erect spinal column and head. Also lateral flexion of the trunk

Mnemonic: I Like Standing

Illiocostalis (lateral) on ilium to ribs
Longissimus (intermediate) tranverse process and vertebrae ( all up to head and neck)
Spinalis (medial) midline and spinous processes

*Know muscle groups from lateral to midline

Muscles of the Arm

MUSCLE

ORIGIN

INSERTION

ACTION

Biceps Brachii

Coracoid process

Long head – superior

Short head - anterior

Radius (radial tuberosity)

Flexion of the elbow

Tricep Brachii

Posterior + lateral scapula and humerus

Posterior ulna (olecranon)

Extension of the elbow

Anterior Thigh

MUSCLE	ORIGIN	INSERTION	ACTION
QUADRICEPS		All via patella tendon
Rectus femoris	Anterior iliac spine of pelvis	Tibial tuberosity	Extends knee, flex hip
Vastus lateralis	Proximal femur	Tibial tuberosity	Extend knee
Vastus intermedius	Proximal femur	Tibial tuberosity	Extend knee
4. vastus medialis	Proximal femur	Tibial tuberosity	Extend knee
sartorius	Ilium ASIS	Tibia prox med	Flex hip, abduct femur
Adductor longus	pubis	Femur - medial	Adduct femur

Hip flexors:

Psoas major	Lumbar vertebrae	femur	Hip flexion; lateral rotation
iliacus	ilium	femur	Hip flexion; lateral rotation

Posterior Thigh

MUSCLE	ORIGIN	INSERTION	ACTION
GLUTEUS MAXIMUS	Posterior pelvis	IT band and femur	Extend and lateral rotate hip
Hamstrings:			Flex knee
semimembranosus	ischium	Medial tibia
semitendinosus	ischium	Medial tibia
Biceps femoral	ischium	Lateral fibula

Lower Leg