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Muscle Functions
Muscle Functions
48
Anatomy
Undergraduate 2
11/03/2010

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Term
when the occipitalis is contracted it raises the eyebrows, and wrinkles the skin of the forehead. when the occipitalis is relaxed it draws the skin anteriorly
Definition
FRONTALIS
Term
it pulls the skin posteriorly
Definition
OCCIPITALIS
Term
together they extend the head by flexing the cervical portion of the vertebral column. alone they turn the head in the direction opposite of the contraction.
Definition
STERNOCLEIDOMASTOID
Term
acts with the masseter to raise and pull back the mandible
Definition
TEMPORALIS
Term
raises and pulls back the lower mandible, closes the mouth and clenches the teeth. it also may move the mandible from side to side.
Definition
MASSETER
Term
closes and protrudes the lips, pulls the lips back against the teeth.
Definition
ORBICULARIS ORIS
Term
elevates the head when contracting together, and rotates the head when contracting singly
Definition
SPLENIUS CAPITIS
Term
elevates and helps the scapulae rotate when adducting the arm.
Definition
RHOMBOIDEUS MINOR
Term
depresses and abducts the scapula, rotates it down and stabilizes
Definition
PECTORALIS MINOR
Term
adducts, flexes and medially rotates the humerus inward
Definition
PECTORALIS MAJOR
Term
abducts the scapula and rotates it upward, lifts the ribs when the scapula is fixed
Definition
SERRATUS ANTERIOR
Term
compresses the abdomen and can rotate the vertebral column
Definition
INTERNAL AND EXTERNAL OBLIQUES
Term
flexes the lumbar region of the vertebral column and compresses the abdomen
Definition
RECTUS ABDOMINIS
Term
elevates and/or adducts the scapula, rotates the scapula up or down, draws the head back when the shoulders are fixed
Definition
TRAPEZIUS
Term
elevates and rotates the scapula downward while adducting the arm
Definition
RHOMBOIDEUS MAJOR
Term
it laterally rotates and abducts the arm at the shoulder
Definition
INFRASPINATUS
Term
laterally rotates, extends, and adducts the humerus at the shoulder and stabilizes the elbow joint
Definition
TERES MINOR
Term
assists the extension of the hmerus, medially rotates the humerus, helps rotate the scapula downward
Definition
TERES MAJOR
Term
extends, adducts, and medially rotates the arm at the shoulder. also draws the arm inferiorly and posteriorly
Definition
LATISSIUMUS DORSI
Term
connective tissue that acts as the origin for muscles of the lower back
Definition
LUMBODORSAL FASCIA
Term
abducts the arm at the shoulder, flexes and medially rotates the arm at the shoulder, and extends and laterally rotates the arm at the shoulder
Definition
DELTOID
Term
flexes the arm and forearm at the shoulder and elbow respectively and rotates the radius to supinate the hand
Definition
BICEPS BRACHII
Term
flexes the forearm at the elbow
Definition
BRACHIALIS
Term
antagonistic to the brachialis, extends the forearm and arm at the elbow and shoulder respectively
Definition
TRICEPS BRACHII
Term
extends and abducts the hand at the wrist functioning in radial hand movement at the wrist
Definition
EXTENSOR CARPI RADIALIS
Term
pronates the forearm and aids in flexing the forearm at the elbow
Definition
PRONATOR TERES
Term
flexes the forewarm at the elbow and supinates and pronates the forearm at the joint btwn the radius and ulna so the forearm is in a neutral position
Definition
BRACHIORADIALIS
Term
flexes and abducts the hand at the wrist
Definition
FLEXOR CARPI RADIALIS
Term
aids the deltoid when abducting the arm at the humerus
Definition
SUPRASPINATUS
Term
extends the four medial digits, spreads the digits as it extends them, extends the wrsit if the fingers are flexed
Definition
EXTENSOR DIGITORUM
Term
flexes and rotates the thigh away form the midline at the hip
Definition
TENSOR FASCIAE LATAE
Term
flexes and draws the thigh toward the midline at the hip, medially rotates the thigh.
Definition
PECTINEUS
Term
laterally rotates the thigh toward the midline and flexes the thigh at the hip
Definition
ADDUCTOR LONGUS
Term
flexes the calf at the knee and flexes, abducts, and laterally rotates the thigh if flexed at the hip
Definition
SARTORIUS
Term
extends the four lateral toes and everts the foot at the ankle
Definition
EXTENSOR DIGITORUM LONGUS
Term
extends the leg at the knee
Definition
VASTUS LATERALIS
Term
extends the leg at the knee. also flexes the thigh at the hip.
Definition
RECTUS FEMORIS
Term
laterally rotates and extends the thigh at the hip
Definition
GLUTEUS MAXIMUS
Term
flexes the leg at the knee, extends the thigh at the hip, and medially rotates the thigh
Definition
SEMITENDINOSUS
Term
flexes the leg at the knee, extends the thigh at the hip, and rotates the thigh laterally if flexed.
Definition
BICEPS FEMORIS
Term
serves as the insertion point for the superficial muscles of the calf
Definition
CALCANEAL TENDON
Term
extends the leg at the knee
Definition
VASTUS MEDIALIS
Term
planar flexes the foot at the ankle and flexes the leg at the knee
Definition
GASTROCNEMIUS
Term
plantar flexes the foot at the ankle
Definition
SOLEUS
Term
dorsally flexes the foot at the ankle and inverts and adducts the foot
Definition
TIBIALIS ANTERIOR
Term
everts and abducts the foot, also weak probides plantar flexion of the foot at the ankle and everts the foot at the intertarsal joints
Definition
PERONEUS LONGUS
Term
flexes the leg at the knee, extends the thigh at the hip, and medially rotates the tibia
Definition
SEMIMEMBRANOSUS
Term
connects the tibial tuberosity to the quadriceps tendon
Definition
PATELLAR LIGAMENT
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