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Muscles of the Upper Limb

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Presentation on theme: "Muscles of the Upper Limb"— Presentation transcript:

1 Muscles of the Upper Limb
Muscles equal movement…

2 What muscles do you already know?

3 Questions What are the three types of muscle contractions in the body?
How can you remember which muscles move a specific joint? What happens to the muscles at a specific joint during each type of muscle contraction? Hint: choose a joint, then figure out the muscles that move it and the movements it makes. Then, apply this knowledge to each type of muscle contraction.

4 Posterior View of Back Levator Scapulae Rhomboid Minor Supraspinatus
Infraspinatus Teres Minor Latissimus dorsi Rhomboid Major

5 Motions of Muscles Trapezius Latissimus Dorsi Rhomboids
Scapular elevation, adduction, retraction, upward rotation and depression, also extends neck Latissimus Dorsi Adductor, extensor & internal rotator of arm Rhomboids Assist trapezius in downward rotation of the scapula and adduction or retraction of scapula Levator Scapulae Elevates the scapula and helps rotate the scapula downward

6 Muscles of the Rotator Cuff
Supraspinatus Teres minor Infraspinatus Show scapula! Subscapularis - Sits on anterior side of Scapula

7 Motions of Muscles for Rotator Cuff
Supraspinatus Abducts the shoulder Infraspinatus Laterally Rotates the Shoulder Teres Minor Laterally rotate the shoulder Subscapularis Rotates humerus medially, stabilizes the shoulder All three of these muscles help stabilize the shoulder joint

8 Muscles that Move the Humerus
Deltoid (anterior and lateral heads) Pectoralis Major Coracobrachialis

9 Motions of Muscles Deltoid Coracobrachialis Teres Major
Anterior Head Flexes and medially rotates the shoulder joint Lateral Head Abducts the arm Posterior Head Extends and laterally rotates the arm Coracobrachialis Acts as a flexor and adductor of the arm Teres Major Medial rotator, adductor and helps extends the humerus at the arm Pectoralis Major Internal rotation, adduction and flexion of the arm

10 Muscles that Move the Humerus – cont’d
Coracobrachialis Pectoralis minor Serratus anterior

11 Motions of Muscles Pectoralis Minor Serratus Anterior
Elevates the ribs and depresses and protracts the scapula Serratus Anterior Upward rotation, abduction or protraction of the scapula

12 Elbow Flexors / Extensors – Anterior
Biceps brachii Brachialis Brachioradialis Pronator teres

13 Motions of Muscles Biceps Brachii Brachialis Brachioradialis
Supinator in the forearm, acts to flex the elbow Brachialis Acts as an elbow flexor Brachioradialis Elbow flexor

14 Elbow Flexors / Extensors – Posterior
Triceps brachii (short head) Triceps brachii (long head) .

15 Motions of Muscles Triceps Brachii Main extensor of the forearm
Has three heads Short, long and medial

16 Muscles of the Forearm – Anterior
Biceps brachii Brachioradialis

17 Muscles of the Forearm – Posterior
Triceps brachii (lateral head) Brachioradialis

18 Extrinsic Hand Muscles – Anterior
Flexor carpi radialis Palmaris longus Flexor carpi ulnaris Flexor digitorum superficialis

19 Extrinsic Hand Muscles – Posterior
Extensor carpi radialis longus Extensor digitorum Extensor carpi ulnaris Extensor carpi radialis brevis Extensor digitorum minimis

20 Motions of Muscles Using the wrist as an example, deduce the muscles that are responsible for the movements that happen around that joint. What are the movements around the wrist? Flexors Flexes hand and wrist Adducts and abducts wrist Extensors Extends hand and wrist Adducts and abducts wrist

21 Muscle Contractions What are the 3 types of muscle contractions?
Concentric (___________) Ex. Bicep shortens when lifting an object Eccentric (____________) Ex. Bicep lengthens when putting same object down Isometric (________) When trying to lift an immovable object!

22 Back to the Questions: What are the three types of muscle contractions in the body? How can you remember which muscles move a specific joint? What happens to the muscles at a specific joint during each type of muscle contraction?

23 Antagonist vs. Agonist Muscles
How do muscles work together in the human body? One muscles (extensor) is required to move the bone in the opposite direction and stretches opposite the muscle (flexor) The flexor and extensor in this case are described as anatagonistic muscles

24 Antagonist vs. Agonist Muscles
The muscle primarily responsible for movement of a body part Antagonist Muscle Muscle that contracts the agonist, lengthening when the agonist muscle contracts

25 Antagonistic Pairs What are some example of Antagonist and Agonist muscles in the upper limb? Biceps Brachii and Triceps Brachii When you Flex your Biceps, your triceps extends Deltoid and Latissimus Dorsi When you abduct your shoulder your deltoid flexes and your latissimus dorsi extends Wrist flexion – Flexor Carpi radialis and extensor carpi radialis

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