Muscle Practical II

Origin

Triceps Brachii; long head- infraglenoid tubercle of scapula, lateral head- posterior humerus, medial head- medial humerus

Insertion

Triceps Brachii; Olecranon process

Action

Triceps Brachii; Extends forearm (elbow)

Origin

Biceps Brachii; long head- supraglenoid tubercle, short head- coracoid process

Action

Biceps Brachii; Flexes and supinates forearm

Insertion

Biceps Brachii; radial tuberosity

Origin

Brachioradialis; Distal humerus

Insertion

Brachioradialis; Styloid process of radius

Action

Brachioradialis; Flexes forearm

Origin

Brachialis; Distal anterior humerus

Insertion

Brachialis; Coronoid process of ulna

Action

Brachialis; Flexes forearm

Origin

Flexor carpi radialis; Medial epicondyle of humerus

Insertion

Flexor carpi radialis; Metacarpals 2 and 3

Action

Flexor carpi radialis; Flexes and abducts hand

Origin

Flexor Carpi Ulnaris; Medal epicondyle of humerus

Insertion

Flexor Carpi Ulnaris; Medial carpals and meta carpals 5

Action

Flexor Carpi Ulnaris; Flexes and adducts hand

Origin

Extensor Carpi Radialis Longus; Lateral distal humerus

Insertion

Extensor Carpi Radialis Longus; Metacarpal 2

Action

Extensor Carpi Radialis Longus; Extends and abducts hand

Origin

Extensor Carpi Ulnaris; Lateral Epicondyle of humerus

Insertion

Extensor Carpi Ulnaris; Metacarpal 5

Action

Extensor Carpi Ulnaris; Extends and adducts hand

Origin

Psoas Major; Transverse processes and bodies of lumbar vertebrae

Insertion

Psoas Major; Lesser trochanter

Action

Psoas Major; Flexes thigh

Origin

Iliacus; Iliac fossa

Insertion

Iliacus; Lesser trochanter

Action

Iliacus; Flexes thigh

origin

Sartorius; Anterior superior iliac spine

insertion

Sartorius; medial condyle of tibia

Action

Sartorius; Flexes; abducts and laterally rotates thigh; flexes leg (knee)

Origin

Tensor fascia latae; Iliac crest and anterior superior iliac spine

Insertion

Tensor fascia latae; Iliotibial tract

Action

Tensor fascia latae; Flexes, abducts and medially rotates thigh

Origin

Gracilis; Body and inferior ramus of pubis

Insertion

Gracilis; Medial surface of proximal tibia

Action

Gracilis; Adducts thigh; flexes leg

Origin

Rectus femoris; Anterior inferior iliac spine

Insertion

Rectus femoris; Tibial tuberosity via patella ligament

Action

Rectus femoris; Flexes thigh; extends leg (knee)

Origin

Vastus Lateralis; Greater trochanter, intertrochanteric line and Linea aspera

Insertion

Vastus Lateralis; Tibial tuberosity via patella ligament

Action

Vastus Lateralis; Extends leg (knee)

Origin

Vastus medialis; Linea aspera and medial femur

insertion

Vastus medialis; Tibial tuberosity via patella ligament

Action

Vastus medialis; Extends leg (knee)

Origin

Vastus intermedius; Anterior and lateral proximal femur

Insertion

Vastus intermedius; Tibial tuberosity via patella ligament

Action

Vastus intermedius; Extends leg (knee)

Origin

Gluteus maximus; Posterior ilium, sacrum, and coccyx

Insertion

Gluteus maximus; Gluteal tuberosity

Action

Gluteus maximus; Extends, abducts, and laterally rotates thigh

Origin

Gluteus Medius; Posterior surface of ilium

insertion

Gluteus Medius; Greater trochanter

Action

Gluteus Medius; Abducts and medially rotates thigh

Origin

Biceps femoris; *Long head:* Ischial tuberosity, *Short head:* posterior femur

Insertion

Biceps femoris; Head of fibula and lateral condyle of tibia

Action

Biceps femoris; Extends thigh (hip), flexes leg (knee)

Origin

Semitendinosus; Ischial tuberosity

Insertion

Semitendinosus; Proximal medial tibia

Action

Semitendinosus; Extends thigh (hip), flexes leg (knee)

Origin

Semimembranosus; Ischial tuberosity

Insertion

Semimembranosus; Posterior medial condyle of tibia

Action

Semimembranosus; Extends thigh (hip), flexes leg (knee)

Origin

Tibialis Anterior; Lateral condyle and proximal tibia

Insertion

Tibialis Anterior; Medial tarsal and metatarsal 1

Action

Tibialis Anterior; Dorsiflexes and inverts foot (ankle)

Origin

Fibularis Longus; Proximal lateral fibula (head)

Insertion

Fibularis Longus; Medial tarsal and metatarsal 1 (curves UNDER foot)

Action

Fibularis Longus; Plantar flexes and everts foot (ankle)

Origin

Gastrocnemius; Femoral condyles

Insertion

Gastrocnemius; Calcaneus (via calcaneal tendon)

Action

Gastrocnemius; Flexes leg; plantar flexes foot

Origin

Soleus; Head of fibula and proximal tibia

Insertion

Soleus; Calcaneus (via calcaneal tendon)

Action

Soleus; Plantar flexes foot