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Intro to Anatomy 2 (MUSCLES)

Updated on July 7, 2014

Introduction to Anatomy of the Human Body

I am currently enrolled in Anatomy and Human Physiology. I hope to help myself study for the finals as well as have a good place to combine knowledge and resources I have found to be helpful throughout the class. The best of luck to you on your endeavors.

Please visit my others sites

- Anatomy Resources

- Intro to Anatomy (BONES)

- Intro to Anatomy (BRAIN/NERVES)

- Intro to Medical Terminology

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Photo by VictoriaBrown13

MUSCLE types

Muscle types
Muscle types

Cardiac Muscle: The muscles forming the heart, involuntary movement

Skeletal Muscle: Muscles which move the skeleton which can act voluntarily or involuntarily.

-Circular: A circular muscle with a hole such as orbicularis occuli

-Quadrate: create seperate bundles of muscle such as the rectus abdominis

-Flat: flat and parallel fibers such as the external obliques

-Fusiform: multiple ends but one base such as the biceps brachii

-Bi-/Uni-/Multi- Pennate: look like feather one, two or many such as the rectus femoris

Smooth Muscle: The lining of internal organs, involuntary movement.

MUSCLE movement

Muscle movements
Muscle movements

So.. What is required for a muscle to produce movement

-A muscle must cross the joint that it moves.

-A muscle can only shorten or relax. Shortening brings both ends of the muscle closer together.

What movements can occur:

-Abduction/Adduction: Movement away or toward the longitudinal axis

-Circumduction: Circular motion which creates a cone like shape.

-Depression/Elevation: Movement to lower or raise a certain body part.

-Flexion/Extension: Movement to decrease/increase the angle of an appendage at the joint.

-Horizontal Abduction/Horizontal Adduction: The arm is at a 90 degree angle from the torso and the arm is brought away from or toward the body center.

-Lateral Rotation/ Medial Rotation: Rotation towards the side/middle of the body.

-Supination/pronation: Occurs in the forearm, twisting the hand so the palm is upward/downward.

MUSCLES of the Shoulder and Upper Arm

Muscles that affect movement of the Scapula

-Pectoralis Major: (movement:Pulls anteriorly and inferiorly to the body wall.)

-Pectoralis Minor: (movement:Pulls anteriorly and inferiorly to the body wall.)

-Serratus anterior: (movement:Protracts, rotates and holds towards wall of body.)

-Trapezius: (movement:elevates, depresses and retracts)

-Rhomboid Major: (movement:retracts and stabilizes in place)

-Rhomboid Minor: (movement:retracts and stabilizes in place)

-Levator Scapulae: (movement:elevates, tilts and rotates)

Muscles that affect movement at the Glenohumeral Joint

-Deltoid (3 parts: clavicular, acromial and spinal)(movements: flexion, extension, abduction, adduction,etc...)

-Infraspinatus (movements: lateral rotation, stabilize glenohumeral joint)

-Latissimus Dorsi: (movement: extension, adduction, medial rotation)

-Pectoralis Major: (movement: Adduction, flesion, extension, and medial rotation)

-Supraspinatus (movements: some abduction, stabilize glenohumeral joint)

-Subscapularis (movements: helps to hold humerus in glenoid cavity, medial rotation)

-Teres Minor(movement: lateral rotation)

-Teres Major (movement: medial rotation, adduction)

Muscles of the Rotator Cuff (rotation of the glenohumeral joint)

-Subscapularis: medial rotation

-Suprascapularis: lateral rotation

-Infraspinatus: lateral rotation

-Teres Minor: lateral rotation

This is the work of someone studying for the anatomy mid-term. Pretty good idea unless it doesn't wash off before the test in which case it might look like cheating.

MUSCLE: Memorization Tips

Anterior Forearm Muscles

-Pro, Flex, Palm, Flex (thumb to medial epicondyle, four fingers to anterior forearm

-Pronator teres (pointer finger), Flexor carpi radialis (middle finger),

-Palmaris longus (ring finger), Flexor carpi ulnaris (pinky finger)

Brachial Plexus

Read the damn cadaver book!!!

Rami, trunks, divisions, cords and branches

Branches of the Brachial Plexus

MR MAU (lateral to medial branches)

Musculocutaneous nerve, Radial nerve, Median nerve, Axillary nerve, Ulnar nerve

Pes Anserine Muscles

Say Grace Before Tea (all cause knee flexion)





---Easy Anatomy Study Aids---

MUSCLES of the elbow and forearm

Muscles that affect movement of the Elbow Joint



-Biceps Brachii


Muscles that cause pronation/supination of the forearm


-Pronator Quadratus

-Pronator Teres

MUSCLE Pronunciation

Anatomy Songs and Visuals

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    • iijuan12 profile image

      iijuan12 5 years ago from Florida

      Great lens! I especially love the drawings!