Muscles in the Shoulder, Chest, Arm, Stomach, and Back

Muscles in the Shoulder, Chest, Arm, Stomach, and Back

Shoulder Muscles

Trapezius Traps

Deltoid Delts

Trapezius (Traps) Function: Raises

head and shoulders

Origin: back of the neck and upper vertebrate

Insertion: clavicle and scapula

Deltoid (Delts) Function: Raises

the upper arm

Origin: the spine of the scapula and the clavicle

Insertion: the top of the humerus

Back

Teres Major Latissimus Dorsi

Lats Erector Spinae Rhomboids

Teres Major Function:

rotation of the humerus

Origin: scapula

Insertion: humerus

Latissimus Dorsi (Lats) Function: moves

the arm backward

Origin: lumbar vertebrae

Insertion: humerus

Erector Spinae Function:

straightens the back

Origin: lower thoracic vertebrae and top of pelvis

Insertion: back of ribs and upper thoracic vertebrae

Rhomboids Function: (deep

muscle) extends the scapula (under the teres

major)

Origin: thoracic vertebrae

Insertion: front of scapula

Chest Muscles

Pectoralis Major Pecs

Serratus Anterior

Pectoralis Major (Pecs) Function: Moves

the arm across the chest

Origin: sternum and clavicle

Insertion: medial and lateral top of the humerus

Serratus Anterior Function: Moves

the scapula forward

Origin: upper ribs / side of the ribs

Insertion: scapula

Quiz

1. Name one of the two parts of muscle.2. The place where a muscle is anchored is

called what? 3. The temporalis and the masseter work

together to perform what function? 4. Name two of the six muscles of the

shoulder and back.5. What muscle group works in a pair with

your Lats (Latissimus Dorsi)?

Quiz/Review1. Name one of the two parts of muscle.

Tendon, Belly2. The place where a muscle is anchored is called what?

Origin3. The temporalis and the masseter work together to

perform what function? Move the lower jaw

4. Name two of the six muscles of the shoulder and back.

Traps, Delts, Teres Major, Lats, Erector Spinae,Rhomboids

5. What muscle group works in a pair with your Lats (Latissimus Dorsi)?

Pecs (Pectoralis Major)

Arm Muscles

Biceps Triceps Brachioradialis Flexor Carpi Extensor Carpi

Biceps Function: flexes

arm (anterior)

Origin: side of the scapula

Insertion: radius/ulna

Triceps Function:

extends/straightens arm (posterior)

Origin: side of the scapula and the humerus

Insertion: upper ulna

Brachioradialis Function: flexes the

elbow

Origin: lateral epicondyle of humerus

Insertion: radius

Flexor Carpi Function: Closes the

hand and fingers and flexes the wrist (anterior)

Origin: medial epicondyle of humerus

Insertion: metacarpals

Extensor Carpi Function: Opens the

hand and fingers and extends the wrist (posterior)

Origin: lateral epicondyle of humerus

Insertion: metacarpals

Stomach & Abdomen

Rectus Abdominis Abs

External Obliques

Internal Obliques

Rectus Abdominis Function: flexes

trunk of the body & pulls ribs to pelvis

Important for posture

Origin: front of pelvis

Insertion: front of ribs

Obliques External Oblique:

flexes the trunk of the body and twists torso

Origin: lower ribs

Insertion: top of pelvis

Internal Oblique: Same as external, except a deeper set of muscles