Actions of Erector Spinae: IIiocostalis, Longissimus, and Spinalis

Extension, lateral flexion, and rotation of the vertebral column

Flexion, abduction, and adduction of the vertebral column

Dorsiflexion, plantar flexion, and pronation of the vertebral column

Circumduction, inversion, and eversion of the vertebral column

Actions of External Intercostals

Elevate the ribs during inhalation

Assist in bending the trunk laterally

Contract the diaphragm during exhalation

Lower the ribs during inhalation

Actions of Internal Intercostals

Depress the ribs and decrease thoracic cavity volume

Elevate the ribs and increase thoracic cavity volume

The diaphragm contracts during inhalation and relaxes during exhalation.

The diaphragm remains stationary during breathing.

The diaphragm expands during exhalation and contracts during inhalation.

The diaphragm only contracts during exhalation.

Action of Rectus Abdominis

Flex the trunk, compress the abdomen, stabilize the pelvis

Action of External Oblique

Compress the abdomen, support the viscera, flex and rotate the trunk, and bend the trunk sideways.

Action of Internal Oblique

Flex and rotate the trunk, compress abdominal contents

Action of Transverse Abdominis

Stabilizing the core and supporting the spine

Action of Pectoralis Minor

Stabilize and depress the scapula

Elevate and protract the scapula

Action of Serratus Anterior

Protraction and stabilization of the scapula

Elevate, retract, and depress the scapula

Protract, extend, and rotate the scapula

Flex, abduct, and adduct the scapula

Contract, relax, and stabilize the scapula

Action of Levator Scapula

Elevate the scapula towards the neck

Rotate the scapula towards the spine

Extend the scapula away from the body

Depress the scapula away from the neck

Action of Rhomboideus Major and Minor

Retraction and stabilization of the scapula towards the spine

Protraction of the scapula away from the spine

Elevation of the scapula towards the spine

Flexion of the scapula away from the spine

Action of Pectoralis Major

Adduct and medially rotate the arm at the shoulder joint

Rotate the arm at the wrist joint

Flex and extend the arm at the elbow joint

Abduct and laterally rotate the arm at the shoulder joint

Action of Latissimus Dorsi

Adduct, extend, and internally rotate the shoulder joint

Abduct, extend, and externally rotate the shoulder joint

Adduct, flex, and externally rotate the shoulder joint

Abduct, flex, and externally rotate the shoulder joint

Abduction of the arm at the shoulder joint

Extension of the arm at the shoulder joint

Adduction of the arm at the shoulder joint

Flexion of the arm at the shoulder joint

Action of Teres major

Medially rotate and adduct the arm at the shoulder joint

Laterally rotate and abduct the arm at the shoulder joint

Action of Supraspinatus

Initiate abduction of the arm at the shoulder joint

Internal rotation of the shoulder

Action of Infraspinatus

Lateral rotation of the arm at the shoulder joint

Abduction of the arm at the shoulder joint

Flexion of the arm at the shoulder joint

Medial rotation of the arm at the shoulder joint

Action of Teres Minor

External rotation of the shoulder joint

Adduction of the shoulder joint

Action of Subscapularis

Internal rotation of the shoulder joint and stabilization of the head of the humerus within the glenoid fossa

External rotation of the shoulder joint

Abduction of the shoulder joint

Action of Triceps Brachii

Adduction of the shoulder joint

Action of Biceps Brachii

Flex the elbow joint and supinate the forearm

Flex the knee joint and dorsiflex the foot

Extend the elbow joint and pronate the forearm

Adduct the shoulder joint and internally rotate the arm

Action of Flexor Carpi Radialis

Wrist flexion and radial deviation

Shoulder abduction and external rotation

Elbow extension and ulnar deviation

Action of Palmaris Longus

Flexion of the hand at the wrist joint

Rotation of the hand at the wrist joint

Abduction of the hand at the wrist joint

Extension of the hand at the wrist joint

Action of Flexor Carpi Ulnaris

Flexion and adduction of the hand at the wrist joint

Extension and abduction of the hand at the wrist joint

Action of Flexor Digitorum Superficialis

Flexion of middle phalanges of the fingers

Extension of middle phalanges of the fingers

Action of Flexor Pollicus Longus

Flexion of the thumb at the interphalangeal joint

Extension of the thumb at the interphalangeal joint

Abduction of the thumb at the interphalangeal joint

Pronation of the thumb at the interphalangeal joint

Action of Flexor Digitorum Profundus

Flexion of distal interphalangeal joints

Extension of proximal interphalangeal joints

Action of Carpi Radialis Longus and Brevis

Extension of the wrist and abduction of the hand at the wrist joint

Rotation of the wrist and flexion of the hand at the wrist joint

Abduction of the wrist and extension of the hand at the wrist joint

Flexion of the wrist and adduction of the hand at the wrist joint

Action of Extensor Digitorum

Extension of the fingers and wrist

Flexion of the fingers and wrist

Action of Extensor Pollicus Brevis and Longus

Extends distal Phalanx of Pollex

The extensor pollicis brevis extends the wrist

The extensor pollicis longus extends the index finger

The extensor pollicis brevis flexes the thumb

Primary flexor of the hip joint, working with the psoas major muscle to lift the thigh towards the abdomen.

Responsible for ankle dorsiflexion

Flex, abduct, and laterally rotate the hip joint; flex the knee joint

Abduct, flex, and medially rotate the hip joint; extend the knee joint

Extend, adduct, and medially rotate the hip joint; extend the knee joint

Flex, adduct, and medially rotate the hip joint; flex the ankle joint

Action of Adductor Magnus

Adduction, extension, and medial rotation of the thigh at the hip joint

Abduction, flexion, and lateral rotation of the thigh at the hip joint

Adduction, flexion, and lateral rotation of the thigh at the hip joint

Adduction, extension, and lateral rotation of the thigh at the hip joint

Action of Adductor Brevis

Adducts the thigh at the hip joint

Rotates the thigh at the hip joint

Abducts the thigh at the hip joint

Flexes the thigh at the hip joint

Anatomy Muscles Actions

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MULTIPLE CHOICE QUESTION

45 sec • 1 pt

Action of Occipitofrontalis

raises eyebrow and pulls scalp posterior

closes lips

raises eyebrow and pulls scalp anterior

allows squinting

MULTIPLE CHOICE QUESTION

45 sec • 1 pt

action of Orbicularis Occuli

Moves the eyebrows

Closes the eyelids squint, and blink

Widen the eyes

Open the eyelids

MULTIPLE CHOICE QUESTION

45 sec • 1 pt

action of Orbicularis oris

Control jaw movement

Raise the upper lip

Close and protrude the lips, shape the lips during speech and facial expressions

Widen the mouth

MULTIPLE CHOICE QUESTION

45 sec • 1 pt

actions of the buccinator

Raises the eyebrows

Contracts the lips

Compresses the cheeks against the teeth and gums

Expands the cheeks against the teeth and gums

MULTIPLE CHOICE QUESTION

45 sec • 1 pt

Actions of masseter

Assists in closing the mouth

Elevates the mandible during chewing

Moves the mandible from side to side

Depresses the mandible during chewing

MULTIPLE CHOICE QUESTION

45 sec • 1 pt

action of Temporalis

Depresses the mandible during chewing

Protracts the mandible during chewing

Assists in lateral movement of the mandible during chewing

Elevates and retracts the mandible during chewing

MULTIPLE CHOICE QUESTION

45 sec • 1 pt

action of Sternocleidomastoid

Extend the neck

Flex the head to the same side

Rotate the head to the opposite side and flex the neck

Rotate the neck to the same side

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