Muscles List Flashcards
latissimus dorsi (origin & insertion)
Origin: spinous process of vertebrae T6-L5, thoracolumbar fascia, iliac crest, Inferior 3 or 4 ribs, Inferior angle of scapula
insertion: intertubercular groove of the humerus
latissimus dorsi- innervation & action
Innervation: thoracodorsal nerve
Action: Adducts, extends and internally rotates the arm, very powerful rotator of the trunk
biceps brachii (origin & insertion)
Origin
short head: coracoid process of scapula
long head: supraglenoid tubercle
Insertion
radial tuberosity & bicipital aponeurosis
biceps brachii- innervation and action
innervation: musculocutaneous nerve
Action: Flexes elbow, flexes and abducts shoulder, supinates radioulnar joint in the forearm
triceps brachii (innervation and action)
innervation- radial nerve
action- extends forearm, long head extends, adducts arm, extends shoulder
triceps brachii (origin & insertion)
Origin
long head- infraglenoid tubercle of scapula
lateral head- above the radial groove
medial head- below the radial groove
Insertion
olecranon process of ulna
deltoid origin and insertion
- origin
lateral third of clavicle
acromion process
the spine of the scapula - insertion
deltoid tuberosity of humerus
deltoid (innervation & action)
innervation: axillary nerve
action: shoulder abduction, flexion, extension
sternocleidomastoid origin and insertion
origin
manubrium
medial portion of the clavicle
insertion
mastoid process of the temporal bone
sternocleidomastoid innervation and action
innervation- motor: spinal accessory nerve
Action
unilaterally
contralateral cervical rotation
ipsilateral cervical flexion
bilaterally
cervical flexion
elevation of sternum
assists in forced inhalation
pectoralis major innervation action
innervation: pectoral nerve
adducts and medially rotates the humerus
draws the scapula anteriorly and inferiorly
pectoralis major- origin and insertion
Clavicular head:
medial half of the clavicle
Sternocostal head:
sternum
superior six costal cartilages
aponeurosis of external oblique muscle
biceps femoris- innervation and action
innervation-
long head: tibial nerve
short head: fibular nerve
action
flexes knee joint
lat. rotates knee joint (when knee is flexed)
extends hip joint (long head only)
biceps femoris- origin and insertion
origin
tuberosity of the ischium
linea aspera of the femur
insertion
head of the fibula which articulates with the back of the lat. tibial condyle
gluteus maximus- innervation and action
innervation- gluteal nerve
ext. rotation and extension of the hip joint
supports the extended knee through the iliotibial tract
chief antigravity muscle in sitting and abduction of the hip
gluteus maximus- origin and insertion
origin
gluteal surface of ilium
lumbar fascia
sacrum
sacrotuberous ligament
insertion
gluteal tuberosity of the femur
iliotibial tract
gastrocnemius- innervation and action
innervation- tibial nerve
plantar flexes foot
flexes knee
gastrocnemius- origin and insertion
Origin
lateral condyle of femur
medial condyle of femur
Insertion
achilles tendon AKA calcaneal tendon
rectus femoris- origin and insertion
origin
inferior iliac spine
groove on the iliac portion of the acetabulum
insertion
patellar tendon
rectus femoris- innervation and action
femoral nerve
knee extension
hip flexion
