Muscles of the chest and abdomen Lab #19 Muscles of the chest and abdomen

Lab 19: Muscles of the chest and abdomen Note: if it’s not on the list, you don’t have to locate it or write about it in the lab report

Muscles to know pectoralis major serratus anterior intercostals (external, internal) diaphragm rectus abdominus obliques (external, internal) transverse abdominus trapezius latissimus dorsi splenius capitus

Oblique and rectus muscles Lie within the body wall Generally: obliques groups are lateral rectus muscles lie on the anterior midline

Oblique and Rectus Muscles Oblique muscles: compress underlying structures rotate vertebral column Rectus muscles: flex vertebral column oppose erector spinae

Cervical Oblique Muscles FYI: Cervical region: scalene muscles flex the neck

Oblique and Rectus Muscles of the Thoracic region Figure 11–11a, b

Thoracic Oblique Muscles Thoracic region: intercostal muscles (external and internal intercostals): respiratory movements of ribs FYI: transversus thoracis: cross inner surface of ribs

Thoracic Rectus Group Diaphragmatic muscle or diaphragm: divides thoracic and abdominal cavities performs respiration

Oblique and Rectus Muscles of the Abdominopelvic region Figure 11–11a, c

Abdominopelvic Oblique Muscles Abdominopelvic region (same pattern as thoracic): external oblique muscles internal oblique muscles Transversus abdominis – deep to internals

Rectus Group -Abdominopelvic Rectus abdominis: between xiphoid process and pubic symphysis divided longitudinally by linea alba divided transversely by tendinous inscriptions

Summary: Oblique and Rectus Muscles Table 11–9 (1 of 2)

Muscles that Position the Pectoral Girdle Figure 11–14b

Muscles that Position the Pectoral Girdle (1 of 3) Trapezius: HUGE superficial covers back and neck to base of skull inserts on clavicles and scapular spines

Muscles that Position the Pectoral Girdle (2 of 3) Rhomboid and levator scapulae: deep to trapezius attach to cervical and thoracic vertebrae insert on scapular border

Muscles that Position the Pectoral Girdle (3 of 3) Serratus anterior: on the chest originates along ribs inserts on anterior scapular margin “serrated”

Summary: Muscles that Position the Pectoral Girdle Tables 11–11

Note Seven of the muscles of the shoulder (on quiz 1) are in Lab 20, exercise 1 which we won’t get to until next week but you still need to learn them for the quiz next week (Quiz 8)

Lab 20 exercise 1 Locate the 7 shoulder muscles from your list: deltoid teres major infraspinatus supraspinatus subscapularis levator scapulae rhomboid

Muscles that Move the Arm Figure 11–15b

Muscles that Move the Arm (1 of 3) Deltoid: the major abductor of arm Supraspinatus: assists deltoid Subscapularis and teres major: produce medial rotation at shoulder

Muscles that Move the Arm (2 of 3) Infraspinatus: produce lateral rotation at shoulder

Muscles that Move the Arm (3 of 3) Pectoralis major: between anterior chest and greater tubercle of humerus produces flexion at shoulder joint Latissimus dorsi: between thoracic vertebrae and humerus produces extension at shoulder joint

Shoulder flexion vs extension Lats and portion of delts Pecs and portion of delts

The Rotator Cuff Muscles involved in shoulder rotation supraspinatus, subscapularis, infraspinatus, teres minor,and their tendons

Muscles that Position the Pectoral Girdle Rhomboid and levator scapulae: deep to trapezius attach to cervical and thoracic vertebrae insert on scapular border Also saw trapezius and serratus anterior

Today Work through activities 1-3 with books, models. Cut 4 and 5 except splenius capitus in activity four; besides that one, you don’t have to do any of 4 or 5 Lab report #19 due (with 18) next week