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Questions and Answers
What is the action of the extensor digitorum muscle?
Wrist extension, extension of digits 2-5
Which nerve innervates the extensor digiti minimi muscle?
Deep radial nerve
What is the action of the extensor carpi ulnaris muscle?
Wrist extension, adduction of the wrist
Which muscle is responsible for abduction of the thumb and wrist?
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What is the innervation of the extensor pollicis brevis (EPB) muscle?
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Which muscle extends the index finger?
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Name a rotator cuff muscle and its action.
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What is the action of the deltoid muscle?
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Which nerve innervates the quadriceps femoris muscle group?
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Name one action of the gastrocnemius muscle in the calf.
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Study Notes
Biceps Femoris
- Origin: Long head from ischial tuberosity, short head from linea aspera of the femur
- Insertion: Head of fibula, lateral surface
- Action: Knee flexion when knee joint is closed; hip extension due to crossing both hip and knee joints
- Innervation: Long head - tibial nerve; short head - common fibulae nerve (peroneal nerve), both branches from sciatic nerve
Semitendinosus
- Origin: Ischial tuberosity
- Insertion: Medial surface of tibia
- Action: Knee flexion
- Innervation: Tibial nerve
Semimembranosus
- Origin: Ischial tuberosity
- Insertion: Medial condyle of tibia
- Action: Knee flexion
- Innervation: Tibial nerve
- Location: Medial aspect of the thigh
Quadriceps
- Comprises four muscles located on the anterior aspect of the thigh
- All insert on a common patellar tendon
Biceps Brachii
- Origin: Short head from coracoid process; long head from supraglenoid tubercle of scapula
- Insertion: Tuberosity of radius
- Action: Flexion at elbow and shoulder; supination of forearm
- Innervation: Musculocutaneous nerve
Brachialis
- Origin: Anterior/distal surface of humerus
- Insertion: Tuberosity of ulna
- Action: Flexion at elbow
- Innervation: Musculocutaneous and radial nerves
Brachioradialis
- Origin: Lateral epicondyle of humerus
- Insertion: Lateral aspect of styloid process of radius
- Action: Flexion at elbow
- Innervation: Radial nerve
Triceps Brachii
- Comprises three heads: long, lateral, and medial
- Origin:
- Lateral head - superior, lateral margin of humerus
- Long head - infraglenoid tubercle of scapula
- Medial head - posterior surface of humerus
- Insertion: Olecranon of ulna
- Action: Extension at elbow
- Innervation: Radial nerve
Pronator Teres
- Origin: Medial epicondyle of humerus
- Insertion: Mid-lateral surface of radius
- Action: Pronation of forearm
- Innervation: Median nerve
Supinator
- Origin: Lateral epicondyle of humerus
- Insertion: Anterolateral surface of radius
- Action: Supination of forearm
- Innervation: Deep radial nerve
Muscles of the Hand and Wrist
- Location, action, and innervation are key focus areas, further details not provided.
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Description
Test your knowledge on the anatomy of the biceps femoris and semitendinosus muscles, including their origin, insertion, actions, and innervation.
