lab 20 muscles of the shoulders, arm, and hand. quiz for next week tuesday or thursday? same format...
TRANSCRIPT
Lab 20
Muscles of the shoulders, arm, and hand
Quiz for next week
• Tuesday or Thursday?
• Same format as today
• Know Upper Arm, Lower Arm, Hip and Thigh, Upper Leg and Lower Leg
Muscles to know
• supraspinatus• infraspinatus• subscapularis• teres major• rhomboid• levator scapulae• deltoid• biceps brachii• brachialis
• triceps brachii• flexor carpi radialis• flexor carpi ulnaris• flexor digitorum sup.• extensor carpi ulnaris• extensor digitorum• extensor carpi radialis• brachioradialis
Cut activity 4
• Only hand muscles you need to know are not explicitly mentioned in the lab (but they do appear in the pictures):– flexor pollicus longus– extensor pollicis longus
Muscles that Move the Arm
Figure 11–15a
Muscles that Move the Arm
Figure 11–15b
Muscles that Move the Arm (1 of 3)
• Deltoid: – the major abductor
• 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
The Rotator Cuff
• Muscles involved in shoulder rotation– supraspinatus, subscapularis, infraspinatus,
teres minor,and their tendons
Summary: Muscles that Move the Arm
Table 11–12
Muscles that Position the Pectoral Girdle
• Rhomboid and levator scapulae:– deep to trapezius– attach to cervical and thoracic vertebrae– insert on scapular border
Muscles that Move the Forearm and Hand
• Originate on humerus and insert on forearm
• Exceptions:– the major flexor (biceps brachii)– the major extensor (triceps brachii)
Extensors and Flexors
• Extensors:– mainly on posterior and lateral surfaces of
arm
• Flexors:– mainly on anterior and medial surfaces
Muscles that Move the Forearm and Hand
• Biceps brachii:– flexes elbow– stabilizes shoulder joint– originates on scapula and humerus– inserts on radial tuberosity
Muscles that Move the Forearm and Hand
• Triceps brachii:– extends elbow– originates on scapula (three spots)– inserts on olecranon
• Brachialis and brachioradialis:– assist in flexing elbow (synergists)
Muscles that Move the Forearm and Hand -Extensors
Figure 11–16a
Muscles that Move the Forearm and Hand - Flexors
Figure 11–16b
Muscles that Move the Forearm and Hand
• Flexor carpi ulnaris: – superficial– flexes wrist– adducts wrist
Muscles that Move the Forearm and Hand
• Flexor carpi radialis: – superficial– flexes wrist– abducts wrist
Muscles that Move the Forearm and Hand
• Extensor carpi radialis:– superficial– extends wrist– abducts wrist
Muscles that Move the Forearm and Hand
• Extensor carpi ulnaris:– superficial– extends wrist– adducts wrist
Figure 11–16a
Figure 11–16b
Summary: Muscles that Move the Forearm and Hand
Table 11–13 (1 of 2)
Today
• Work through lab 20
• Relevant parts of lab reports due Next Week