Muscles of the arm, pelvis, and leg

+

MUSCLES OF
THE HUMAN
BODY

+ VOCABULARY TERMS

 SUPERIOR  ANTERIOR
Nearer to the head Nearer to the front

 INFERIOR  POSTERIOR
Nearer to the feet Nearer to the back

+ VOCABULARY TERMS

 SUPERFICIAL  MEDIAL
Nearer to the Nearer to the
surface of the body median plane

 DEEP  LATERAL
Farther from the Farther from the
surface of the body median plane

+ Muscles of the Arm

+ Anterior Compartment

Biceps Brachii Biceps Brachii

 Has two heads
 Attaches

 proximally to scapula
 distally to proximal part of

ulna
 movements of the arm:

 flexor of the elbow joint
 supinator of the forearm

+ Anterior Compartment Cont’d

 Brachialis Brachialis
Brachioradialis
 Attaches
 proximally to the anterior surface
of the humerus
 distally to the coronoid process of
the ulna

 movements of the arm
 powerful flexor of the elbow joint
 it works along with the biceps
brachii.

 Brachioradialis

 Use this muscle when shaking hands

+ Posterior Compartment Triceps

Triceps Brachii

 Has three heads
 Attaches

 Proximally to humerus
(medial and lateral head)

 Distally to the olecranon
process of the ulna

 Movement of the arm:
 elbow extensor

Brachioradialis

+
Muscles of the Forearm

+

 forearm muscles act on the elbow, wrist and digits
(fingers)

 flexor-pronator group
 attached to the medial epicondyle of the
humerus

 extensor-supinator
 attached to the lateral epicondyle of the humerus

+

Flexors of the forearm

Anterior View Extensors of the forearm
Posterior View

+Muscles of the Pelvic
Girdle

+ Anterior Muscles

Psoas Major Sacrum Iliopsoas Muscle
Iliacus
 A combination of two
other muscles

 Psoas Major

 Iliacus

 Primary flexor of the
hip

 Allows you to bring your
thighs up to your chest or
your chest to your knees

+ Posterior and Lateral Muscles

 gluteals Gluteus
Medius
 include 3 muscles:
Gluteus
 Gluteus maximus Maximus

 Most superficial

 the largest of the three
muscles

 principal extensor of the
hip

 Gluteus medius and minimus

 assist it in hip extension

 abduct the hip

+
Thigh Muscles

+ Medial Compartment

 Pectineus Pectineus
Adductor Brevis
 Gracilis Adductor Longus
Adductor Magnus
 Adductors:
Gracilis
 adductor longus
 adductor brevis
 adductor magnus

Primary action -
adduct the thigh
towards the midline

+ Anterior Compartment

 Quadriceps Rectus Femoris
Sartorius
 Rectus femoris
 Vastus lateralis Vastus Lateralis
 Vastus intermedius Vastus Intermedius
 Vastus medialis.
 Extend the knee Vastus Medialis

 Sartorius

 Lies anterior to the quads
 Use to sit cross-legged or

limbo

+ Posterior Compartment

 Hamstrings Long Head of
Biceps Femoris
 biceps femoris
 Semitendinosus Short Head of
 Semimembranosus Biceps Femoris
Semitendinosis
 Attach
Semimembranosis
 proximally to the ischial tuberosity
 distally, biceps femoris to the head

of the fibula and the
semitendinosus and
semimembranosus to the tibia.

flex the knee

also extend at the hip

+
Leg Muscles

+ Anterior Compartment
 tibialis anterior

 extensor hallucis longus (deep)

 extensor digitorum (deep)

 arise from

 – anterolateral surface of the tibia
 – interosseous membrane between the tibia and the fibula
 – anterior surface of the fibula

 cross anterior to the ankle joint

 attach distally to

 – medial side of the foot
 – distal phalanges of the digits

 movements:

 – primarily dorsi-flexors of the ankle
 – extensors of the toes
 – Tibialis anterior further inverts the foot
 – Peroneus tertius assist in eversion