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

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

2 Shoulder Muscles Deltoid Supraspinatus Infraspinatus Teres Major Teres Minor Subscapularis

3 Deltoid (Delts) Function: Raises the upper arm Origin: the spine of the scapula and the clavicle Insertion: the top of the humerus

4 Supraspinatus Function: Abducts the arm Origin: Supraspinous fossa of the scapula. Insertion: Greater tubercle of the humerus

5 Infraspinatus Function: Rotates the arm laterally Origin: Infraspinous fossa of the scapula Insertion: Greater tubercle of the humerus

6 Teres Major Function: rotation of the humerus Origin: scapula Insertion: humerus

7 Teres Minor Function: Rotates arm laterally Origin: Inferior angle of the scapula Insertion: Greater tubercle of humerus

8 Subscapularis Function: Rotates arm medially Origin: Subscapular fossa of the scapula Insertion: Lesser tubercle of the humerus

9

10 Muscles of the Rotator Cuff

11 Back Muscles Trapezius Traps Latissimus Dorsi Erector Spinae (Group) Iliocostalis Longissimus Spinalis Rhomoids

12 Trapezius (Traps) Function: Raises head and shoulders Origin: back of the neck and upper vertebrate Insertion: clavicle and scapula

13 Latissimus Dorsi (Lats) Function: moves the arm backward Origin: lumbar vertebrae Insertion: humerus

14 Erector Spinae Function: straightens the back Origin: lower thoracic vertebrae and top of pelvis Insertion: back of ribs and upper thoracic vertebrae Made up of three separate muscles

15 Iliocostalis Function: extends vertebral column, laterally flexes vertebral column Origin: Iliac crest, lumbosacral fascia, and ribs 7-12 Insertion: Inferior border of ribs and transverse process of C4 C6

16 Longissimus Function: extends vertebral column, laterally flexes vertebral column Origin: lower thoracic vertebrae and top of pelvis Insertion: back of ribs and upper thoracic vertebrae

17 Spinalis Function: extends vertebral column Origin: Spinous processes of C4 L5 Insertion: Spinous processes of C4 T6

18

19

20 Rhomboids Function: (deep muscle) extends the scapula (under the teres major) Origin: thoracic vertebrae Insertion: front of scapula

21

22 Chest Muscles Pectoralis (Pecs) Major Minor Serratus Anterior

23 Pectoralis Major (Pecs) Function: Moves the arm across the chest Origin: sternum and clavicle Insertion: medial and lateral top of the humerus

24 Pectoralis Minor (Pecs) Function: Scapula protraction, rotation of the scapula downwards Origin: Anterior surfaces of the third to fifth ribs. Insertion: coracoid process of the scapula.

25 Serratus Anterior Function: Moves the scapula forward Origin: upper ribs/side of the ribs Insertion: scapula

26 Stomach & Abdomen Rectus Abdominis Abs External Obliques Internal Obliques

27 Rectus Abdominis Function: flexes trunk of the body & pulls ribs to pelvis Important for posture Origin: front of pelvis Insertion: front of ribs

28 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

29 Diaphragm Muscle

30 Diaphragm Muscle Origin: Attaches to the sternum and xiphoid process anteriorly, the L1 through the L3 lumbar vertebrae and the arcuate ligaments posteriorly Insertion: Attaches to the central aponeurotic tendon Action: Inspiration

31 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)?

32 Quiz/Review 1. Name one of the two parts of muscle. Tendon, Belly 2. The place where a muscle is anchored is called what? Origin 3. 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)

33 Arm Muscles Biceps Brachii Coracobrachialis Brachialis Brachioradialis Triceps Flexor Carpi Extensor Carpi

34 Biceps Brachii Function: flexes arm (anterior) Origin: side of the scapula Insertion: radius/ulna

35 Biceps Brachii Origins

36 Coracobrachialis Function: Flexes the arm at shoulder, Adducts the arm Origin: Coracoid process of the scapula Insertion: Medial Humerus

37 Brachialis Function: Flexes the forearm at elbow Origin: Anterior, distal half of the humerus Insertion: Coronoid process and tuberosity of ulna.

38 Brachioradialis Function: flexes the elbow Origin: lateral epicondyle of humerus Insertion: radius

39 Triceps Function: extends/straight ens arm (posterior) Origin: side of the scapula and the humerus Insertion: upper ulna

40 Triceps Origins

41 Flexor Carpi Function: Closes the hand and fingers and flexes the wrist (anterior) Origin: medial epicondyle of humerus Insertion: metacarpals

42 Extensor Carpi Function: Opens the hand and fingers and extends the wrist (posterior) Origin: lateral epicondyle of humerus Insertion: metacarpals

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