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Similar to Anatomy Lab exercise 11
Anatomy Lab exercise 11
- 1. Lab Exercise 11 INTROTO MUSCLES AND MUSCLES OF THE SHOULDER AND UPPER EXTREMITY
- 2. Intro Muscle Origin The attachment point of the muscle that does not move during muscular contractions Insertion The attachment that moves during contraction Action The effect the muscle has on a part of the body Innervation Specific nerve that innervates the muscle
- 3. Muscle Nomenclature Location Tibialis anterior, frontalis, or temporalis Size Gluteus minimus & gluteus maximus Shape Deltoid muscle Orientation Infraspinatus muscle originates on the infraspinous fossa Origin and insertion Infraspinatus muscle originates on the infraspinous fossa of the scapula Number of heads Triceps with three heads Action Extensor digitorum Length Longus or brevis
- 5. Superficial Muscles ofthe Shoulder Trapezium Extends and abducts head, rotates and adducts scapula, fixes scapula Latissimus Dorsi Extends, ADDucts, and medially rotates arm; draws shoulder inferiorly Deltoid ABDucts; flexes, extends, medially and laterally rotates arm Pectoralis Major Flexes, ADDucts, and medially rotates arm Pectoralis Minor Depresses glenoid cavity, raises ribs 3-5
- 6. Deep Muscles ofthe Shoulder Rotator Cuff Muscles: SITS Supraspinatus ABDucts arm, help stabilizes shoulder joint Infraspinatus Laterally rotates arm, stabilizes shoulder joint Teres Minor Laterally rotates and ADDucts arm, Stabilizes shoulder joint Subscapularis Medially rotates arm, stabilizes shoulder joint Teres Major (NOT a rotator cuff muscle) Extends, ADDucts, and medially rotates arm
- 7. Muscles of theArm Biceps Brachii Flexes arm, flexes forearm, supinates hand Triceps Brachii Extends and ADDucts arm, extends forearm Coracobrachialis Flexes and ADDucts arm Brachialis Flexes forearm Brachioradialis Flexes forearm Pronator Teres Pronates hand, flexes forearm Palmaris Longus Flexes hand Flexor Carpi Radialis Flexes and ADDucts hand
- 8. Muscles of the Arm Flexor Digitorum Superficialis Flexes proximal and ,middle phalanges, flexes hand Extensor Carpi Radialis Longus Extends and ABDucts hand Extensor Digitorum Extends phalanges, extends hand
- 9. Muscles that Supinate theHand Supinator Originates from the forearm and wraps around the radius Pronator Teres Medial side of forearm and lateral side of radius Pronator Quadratus Square muscle deep to the other forearm muscles found on the distal part of the radius and ulna
- 10. Flexor Muscles ofthe Arm Palmaris Longus Absent in ~10% of people Flexor Carpi Radialis Inserts on the metacarpals on the radial side of the hand Flexor Retinaculum Anchors the tendons to the wrist and prevents the tendons from pulling away from the wrist when flexed Flexor Carpi Ulnaris Originates on the medial epicondyle and inserts on the carpals on the ulnar side of hand Flexor Digitorum Superficialis Found under the palmaris longus and flexor carpi radialis Flexor Digitorum Profundus Deep muscle that flexes the digits Flexor Pollicis Longus Originates on the radius and runs laong the medial side of the radius FELXORS MAINLY originates on the MEDIAL EPICONDYLE of the humerus
- 12. Extensor Muscles ExtensorCarpi Radialis Longus Radial side Extensor Carpi Radialis Brevis Deep to longus, and inserts on the dorsum of the 3rd metacarpal Extensor Carpi Ulnaris Ulnar side. Extends and ADDucts the hand Extensor Digitorum Posterior side of hand ALL EXTENSOR’S originates on the LATERAL EPICONDYLE of the humerus
- 13. Intrinsic Muscle ofthe Hand Thenar Eminence Flexor Pollicis Brevis ABDuctor Pollicis Brevis ADDuctor Pollicis Opponens Pollicis Hypothenar Eminence ABDuctor Digiti Minimi Flexor Digiti Minimi Brevis Opponens Digiti Minimi
- 14. Know For TheLab Exam ID shoulder muscles on model Flexors and Extensors of the arm Known the muscles Rotator cuff muscles Supination and pronation