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Posterior Muscles
Posterior Muscles of Body
41
Anatomy
Undergraduate 4
03/01/2010

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Term
Splenius capitis
A,N
Definition
A- extension, hyperextension of skull, rotation and lateral bending of skull toward same side
N- Cervical spinal nerves
Term
Erector Spinae
A
Definition
A- prime mover of back extension
Term
Trapezius
All
Definition
O- occipital bone, ligamentum nuchae, and spinous processes of C7-T12
I- spine and acromion of scapula, lateral 1/3 of clavicle
A- stabilizes, elevates, retracts, depresses, and rotates scapula forward
N- Accessory nerve and spinal nerves C3-C4
Term
Levator Scapulae
All
Definition
O- transverse processes of C1-C4
I- superior vertebral border of scapula
A- elevation and retraction of scapula, flexion of skull to same side
N- Spinal nerves C3-C5
Term
Rhomboideus major
All
Definition
O- spinous processes of T2-T5
I- medial border of scapula from spine to inferior angle
A- adducts scapula and performs downward rotation of scapula
N- spinal nerve C5
Term
Rhomboideus minor
All
Definition
O = spinous processes of C7-T1
I = medial border of scapula, superior to rhomboideus major
A = adducts scapula and performs downward rotation of scapula
N = Spinal Nerve C5
Term
Supraspinatus
All
Definition
O = supraspinous fossa of scapula
I = greater tubercle of humerus
A = stabilizes shoulder joint; abducts arm
N = Suprascapular Nerve
Term
Infraspinatus
all
Definition
O = infraspinous fossa of scapula
I = Greater tubercle of humerus
A = stabilizes shoulder joint; laterally rotates arm
N = Suprascapular Nerve
Term
Rotator Cuff is made of what four muscles
Definition
Supraspinatus, infraspinatus, subscapularus, teres minor
Term
subscapularis
all
Definition
O = subscapular fossa of scapula
I = lesser tubercle of humerus
A = prime medial rotator of arm; stabilizes shoulder joint
N = Subscapular Nerve
Term
Teres major
Definition
O = inferior angle of scapula
I = intertubercular groove of humerus
A = extension, medial rotation, and adduction of arm
N = Subscapular Nerve
Term
teres minor
all
Definition
O = lateral scapular border
I = greater tubercle of humerus
A = stabilizes shoulder joint; laterally rotates arm
N = Axillary Nerve
Term
Latissimus dorsi
all
Definition
O = spines of T7-T12, L1-L5, ribs 8-12, iliac crest, and thoracolumbar fascia
I = intertubercular groove of humerus
A = prime arm extensor; adduction and medial rotation at the shoulder; depresses shoulder
N = Thoracodorsal Nerve (C6-C8)
Term
Triceps Brachii (medial, long, and lateral heads)
all
Definition
O = long head--infraglenoid tubercle of scapula; lateral head--proximal end of lateral humeral margin;
medial head--distal to radial groove on posterior humeral shaft
I = olecranon process of ulna
A = prime extensor of forearm; extends arm
N = Radial Nerve
Term
Anconeus
all
Definition
O = lateral epicondyle of humerus
I = lateral aspect of olecranon process of ulna
A = abduction of ulna during forearm pronation; forearm extensor
N = Radial Nerve
Term
Flexor Carpi radialis
A,N
Definition
A = flexion (powerful) and abduction of hand
N = Median Nerve
Term
Palmaris longus
A,N
Definition
A = weak flexor of hand
N = Median Nerve
Term
Flexor carpi ulnaris
A,N
Definition
A = flexion (powerful) and adduction of hand; stabilizes wrist during finger extension
N = Ulnar Nerve
Term
flexor pollicis longus
a,n
Definition
A = Flexion at joints of thumb
N = Median nerve
Term
flexor digitorum superficialis
a,n
Definition
A = hand and finger flexor (middle phalanges)
N = Median Nerve
Term
flexor digitorum profundus
a,n
Definition
A = hand and finger flexor (mainly distal phalanges)
N = medial half-ulnar nerve; lateral half-median nerve
Term
flexor retinaculum
ID
Definition
Term
gluteus maximus
all
Definition
O = dorsal ilium, sacrum, coccyx, and lumbodorsal fascia
I = gluteal tuberosity of femur and iliotibial tract
A = major thigh extensor; lateral rotation of thigh
N = Inferior Gluteal Nerve
Term
gluteus medius
all
Definition
O = anterior iliac crest of ilium
I = greater trochanter of femur
A = abduction and medial rotation of thigh; steadies pelvis
N = Superior Gluteal Nerve
Term
gluteus minimus
all
Definition
O = lateral surface of ilium
I = greater trochanter of femur
A = abduction and medial rotation of thigh; steadies pelvis
N = Superior Gluteal Nerve
Term
piriformis
all
Definition
O = anterolateral surface of sacrum
I = greater trochanter of femur
A = abduction (when thigh flexed) and lateral rotation of thigh
N = Spinal Nerves L5-S2
Term
superior gemellus
all
Definition
O = ischial spine
I = medial surface of greater trochanter of femur
A = lateral rotation of thigh; abduction (when thigh flexed)
N = Spinal Nerves L5-S1
Term
obturator internus
all
Definition
O = obturator membrane and obturator foramen
I = greater trochanter of femur
A = lateral rotation of thigh
N = Spinal Nerves L5-S1
Term
Inferior gemellus
all
Definition
O = ischial tuberosity
I = medial surface of greater trochanter of femur
A = lateral rotation of thigh; abduction (when thigh flexed)
N = Spinal Nerves L5-S1
Term
quadratus femoris
all
Definition
O = ischial tuberosity
I = intertrochanteric crest of femur
A = lateral rotation of thigh
N = Spinal Nerves L5-S1
Term
biceps femoris (long and short head)
all
Definition
O = long head--ischial tuberosity; short head--linea aspera and distal femur
I = head of fibula and lateral condyle of tibia
A = extension of thigh; flexion and lateral rotation of leg
N= sciatic nerve
Term
semitendinosus
all
Definition
O = ischial tuberosity
I = medial aspect of proximal tibial shaft
A = extension of thigh; flexion and medial rotation of leg
N = sciatic nerve
Term
semimembranosus
all
Definition
O = ischial tuberosity
I = medial condyle of the tibia
A = extension of thigh; flexion and medial rotation of leg
N = sciatic nerve
Term
gastrocnemius (lateral and medial heads)
a,n
Definition
A = plantarflexion and leg flexion
N = tibial nerve
Term
soleus
a,n
Definition
A = plantarflexion, postural muscle
N = tibial nerve
Term
plantaris
Definition
A = plantarflexion and leg flexion
N = tibial nerve
Term
popliteus
a,n
Definition
A = rotates tibia medially on femur, rotates femur laterally on tibia
N = tibial nerve
Term
flexor digitorum longus
Definition
A = plantar flexion; toe flexion (2-5)
50
N = tibial nerve
Term
tibialis posterior
a,n
Definition
A = prime mover of foot inversion; plantar flexion
N = tibial nerve
Term
flexor hallucis longus
a,n
Definition
A = flexion of hallux; plantar flexion
N = tibial nerve
Term
What are the three postural muscles?
Definition
soleus, errector spinae, psoas major
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