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MODULE 04: MUSCLES WHO CONTRACT TOGETHER, STAY TOGETHER
- Course
- ANAT100 (ANAT100)
- Institution
- Queen’s University (QU )
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The serratus anterior muscle is a large “serrated”-shapedmuscle that wraps around the lateral aspect of the rib
MODULE 04 cage to the front part of the scapula.
MUSCLES WHO CONTRACT The pectoralis minor is a deep muscle of the anterior chest.
It is a thin, flat muscle which extends from the anterior
TOGETHER, surface of the upper ribs to the coracoid process of the
scapula.
STAY TOGETHER
SECTION 01: UPPER LIMB MUSCLES
UPPER LIMB MUSCLES OVERVIEW
This section explores the superficial upper limb muscles of the
appendicular skeleton. Only specific major upper limb muscles
are examined in this course.
1. Muscles that Attach
the Axial Skeleton to the
Pectoral Girdle
(Shoulder) POSTERIOR
2. Muscles that Attach There is one main superficial posterior muscle that attaches
the Axial Skeleton to the the axial skeleton to the pectoral girdle, the trapezius.
Arm (Humerus)
3. Muscles that Attach
the Pectoral Girdle to the
Humerus
4. Muscles that Move the
Forearm (Arm Muscles)
5. Muscles that Move the
Wrist (Forearm Muscles)
MUSCLES THAT ATTACH THE AXIAL SKELETON TO THE
PECTORAL GIRDLE (SHOULDER)
MUSCLES THAT ATTACH THE AXIAL SKELETON TO THE ARM
Extrinsic shoulder muscles move the scapula and are (HUMERUS)
divided into anterior and posterior divisions.
There are two muscles that move the humerus.
ANTERIOR
The pectoralis minor and the serratus anterior are anterior ANTERIOR
muscles that attach the axial skeleton, via the rib cage, to The pectoralis major flexes the humerus.
the pectoral girdle.
The pectoralis major attaches the
humerus to the axial skeleton.
, POSTERIOR MUSCLES THAT MOVE THE FOREARM (ARM MUSCLES)
The latissimus dorsi extends the humerus.
These muscles flex and extend the forearm at the elbow
joint. The biceps brachii flexes the forearm, while the triceps
brachii extends the forearm.
The biceps brachii is also a powerful supinator of the
forearm.
ANTERIOR
INTERESTING FACT
If you palpate (examine by touch) below your clavicle, the muscle
you are feeling is your pectoralis major muscle.
MUSCLES THAT ATTACH THE PECTORAL GIRDLE TO THE
HUMERUS
There is one main superficial muscle that moves the
humerus and stabilizes the glenohumeral joint: the deltoid. Biceps brachii
This muscle abducts the arm. You should remember this The word biceps = (indicates) two heads as the prefix bi=
movement which was covered in Module 01. (means) two
The word brachii= (means) arm
Therefore, the biceps brachii muscle has two heads and it is
located in the arm.
POSTERIOR
There are four “rotator cuff muscles” that stabilize the
glenohumeral joint.
Triceps brachii
The word triceps = (indicates) three heads as the prefix tri=
(means) three.
The word brachii = (means) arm
Therefore, the triceps brachii muscle has three heads and it
is located in the arm.
INTERESTING FACT
The rotator cuff muscles are highlighted including the If you palpate the front and back of your arm, you are feeling
Subscapularis, Infraspinatus, Teres Minor and Supraspinatus. these large arm muscles.
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