12 Questions
Which muscle in the pectoral region lies underneath the pectoralis major?
Pectoralis Minor
What is the function of the pectoralis major muscle?
Flexes the upper limb
Which nerve innervates the pectoralis minor muscle?
Medial pectoral nerve
Where does the subclavius muscle originate from?
Costal cartilage of the first rib
Which nerve innervates the pectoralis major muscle?
Medial and lateral pectoral nerves
What is the function of the serratus anterior muscle?
Stabilizes scapula
What is the main difference between extrinsic and intrinsic shoulder muscles?
Extrinsic muscles originate from the torso and attach to the clavicle, scapula, or humerus, while intrinsic muscles originate from the scapula and/or clavicle and attach to the humerus.
Which muscle is known as the most superficial of all back muscles?
Trapezius
What is the main function of the Latissimus dorsi muscle?
Extends, adducts, and medially rotates the upper limb.
Where does the Levator scapulae muscle originate from?
Transverse processes of C1-C4 vertebrae
Which nerve innervates the Rhomboid major muscle?
Dorsal scapular nerve
How many muscles are included in the scapulohumeral group in the intrinsic muscles?
Six
Study Notes
Pectoral Region Muscles
- The pectoralis minor muscle lies underneath the pectoralis major muscle.
Pectoralis Major Muscle
- The pectoralis major muscle is responsible for movements such as flexion, extension, and rotation of the shoulder joint.
Pectoralis Minor Muscle
- The pectoralis minor muscle is innervated by the medial pectoral nerve.
Subclavius Muscle
- The subclavius muscle originates from the first rib.
Pectoralis Major Muscle Innervation
- The pectoralis major muscle is innervated by the lateral and medial pectoral nerves.
Serratus Anterior Muscle
- The serratus anterior muscle is responsible for rotating the scapula and helping to move the arm upward and forward.
Extrinsic and Intrinsic Shoulder Muscles
- The main difference between extrinsic and intrinsic shoulder muscles is that extrinsic muscles originate from outside the shoulder region, while intrinsic muscles originate from within the shoulder region.
Back Muscles
- The trapezius muscle is known as the most superficial of all back muscles.
Latissimus Dorsi Muscle
- The main function of the Latissimus dorsi muscle is to adduct, extend, and rotate the shoulder joint.
Levator Scapulae Muscle
- The Levator scapulae muscle originates from the transverse processes of the cervical vertebrae.
Rhomboid Major Muscle
- The Rhomboid major muscle is innervated by the dorsal scapular nerve.
Scapulohumeral Group
- The scapulohumeral group in the intrinsic muscles includes 17 muscles.
Learn about the anatomy of the pectoralis major muscle, including its attachments, insertion, and functions. Understand the structure of the sternal and clavicular head and their roles in arm movement. Perfect for anatomy enthusiasts and medical students.
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