Shoulder and Arm MusculatureSession 22

Objectives To deduce muscle actions; explain based

on the attachments sites the line of pull each muscle has around a joint.

Apply your knowledge of the attachment site to common movements.

Axio-appendicular Muscles Anterior:

Pectoralis Major Clavicular vs sternal

Pectoralis Minor Subclavius Serratus Anterior

Posterior: Superficial

Trapezius Latissimus

Deep Rhomboids Levator Scap

Scapulohumeral SITS Deltoid

Arm Muscles Anterior:

Biceps Brachii Short head Long head (2 joint)

Brachialis Coracobrachialis

Posterior: Triceps

Lateral head Long head (2 joint) Medial head

Step 1: Meet with your lecture team (of 3).Review the musculature of the shoulder and arm (include axio-appendicular muscles, and arm muscles) and with the list of muscles provided, write down next to each one which joints it affects.

For each action on the next slide, list the muscles that are involved in the movement, with the primary mover first, down to muscles that only help a little or stabilize.

using crutches (shoulder, scapulothoracic, elbow joints)

putting dishes away (shoulder, scapulothoracic joints)

pushing a wheelchair (shoulder, scapulothoracic, elbow joints)

doing a deadlift (shoulder, scapulothoracic, elbow joints)

Step 2: Join up with another group (total 6)Compare your lists and discuss differences.

Your patient cannot hold themselves up on crutches. You know that the supraspinatus must be damaged.

A. TrueB. False

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Which motion does not require pectoralis major clavicular head?

A. Punching someone

B. RowingC. Putting dishes

awayD. Giving a high five

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Coracobrachialis is cool because…

A. It attaches to the coracoid process

B. It does both shoulder flexion and horizontal adduction

C. It attaches to the middle of the humerus

D. It crosses 2 jointsIt a

ttaches t

o the co

racoi...

It does b

oth shoulder fl

e...

It attach

es to th

e middle ..

It crosse

s 2 jo

ints

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The long head of biceps attaches more proximally on the humerus than the coracobrachialis.

A. TrueB. False

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Objectives To deduce muscle actions; explain based

on the attachments sites the line of pull each muscle has around a joint.

Apply your knowledge of the attachment site to common movements.

I would rate today’s class as:(1 is the best, 5 is the worst)A. 1B. 2C. 3D. 4E. 5

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Announcements No Lab Quiz next week

Prepare terms list anyway! Maybe even start learning muscle

attachments on the bones…! Elbow group – scheduling conflict, see

me at the end