Podcast
Questions and Answers
Which muscles are primarily responsible for the movement of the thenar eminence?
Which muscles are primarily responsible for the movement of the thenar eminence?
What is a primary role of the rotator cuff muscles?
What is a primary role of the rotator cuff muscles?
Which muscle is specifically known for inserting into the ulnar tuberosity?
Which muscle is specifically known for inserting into the ulnar tuberosity?
Which muscle is responsible for flexing the thumb across multiple joints?
Which muscle is responsible for flexing the thumb across multiple joints?
Signup and view all the answers
What is the primary function of the brachioradialis muscle?
What is the primary function of the brachioradialis muscle?
Signup and view all the answers
At which joints does the extensor expansion facilitate finger extension?
At which joints does the extensor expansion facilitate finger extension?
Signup and view all the answers
Which action is performed by the supraspinatus muscle?
Which action is performed by the supraspinatus muscle?
Signup and view all the answers
What is the function of the palmar interossei muscles?
What is the function of the palmar interossei muscles?
Signup and view all the answers
Study Notes
Hand Muscles
- Thenar eminence muscles: Abductor pollicis brevis, Flexor pollicis brevis, Opponens pollicis
- Flexor pollicis longus flexes the thumb at the CMC, MCP, and IP joints.
Shoulder Complex Muscles
- Rotator cuff function: Provides dynamic stability to the glenohumeral joint.
- Supraspinatus abducts the arm at the shoulder.
- Teres major medially rotates and adducts the arm.
Forearm Muscles
- Brachialis: Inserts into the ulnar tuberosity and coronoid process, flexing the elbow.
- Brachioradialis: Located on the lateral forearm, primarily flexes the elbow in a neutral hand position.
- Extensor carpi radialis longus: Extends and abducts the wrist.
- Palmar interossei: Adduct the fingers toward the hand's midline.
Joint Stabilizers and Actions
- Glenohumeral joint stabilization: Primarily supported by the rotator cuff muscles, NOT the coracoclavicular ligament. The coracoclavicular ligament stabilizes the acromioclavicular joint.
- Extensor expansion (dorsal hood): Extends the fingers at the PIP and DIP joints.
Studying That Suits You
Use AI to generate personalized quizzes and flashcards to suit your learning preferences.
Description
This quiz explores the essential muscles of the hand, shoulder complex, and forearm, detailing their actions and functions. You'll test your knowledge on muscle groups such as the thenar eminence, rotator cuff, and elbow flexors. Understanding these muscle functions is crucial for grasping human anatomy and biomechanics.
