which muscles are involved in swimimg and climbing: Axiohumeral Muscles
Автор: Dr Saeed Lectures
Загружено: 2025-04-10
Просмотров: 308
Unlock the secrets of the axiohumeral muscles*—the powerhouse duo that bridges your chest and arms! In this video, we'll explore the **pectoralis major* and **latissimus dorsi**, two fascinating muscles that play crucial roles in arm movement and upper body strength. From their origins and insertions to their vital actions in pulling, pushing, and more, we’ll break down their anatomy with engaging visuals and easy-to-follow explanations. Whether you're a student, fitness enthusiast, or anatomy lover, this journey into the heart of human motion will leave you inspired!
*Pectoralis Major*
**Origin**:
Clavicular head: Medial half of the clavicle.
Sternocostal head: Sternum, upper six costal cartilages, and the aponeurosis of the external oblique muscle.
**Insertion**:
Lateral lip of the bicipital groove (intertubercular sulcus) of the humerus.
**Actions**:
Flexion, adduction, and internal rotation of the humerus.
The clavicular head assists in flexing the arm, while the sternocostal head helps in extending the flexed arm.
*Latissimus Dorsi*
**Origin**:
Spinous processes of T7-T12, thoracolumbar fascia, iliac crest, and lower three or four ribs.
Sometimes the inferior angle of the scapula is included.
**Insertion**:
Floor of the bicipital groove (intertubercular sulcus) of the humerus.
**Actions**:
Extension, adduction, and internal rotation of the humerus.
It also plays a role in scapular depression and lateral trunk flexion.
These muscles are vital for upper body movements, especially in activities like swimming, climbing, and lifting. If you'd like more details, feel free to ask!
Here are the *reverse actions* of the pectoralis major and latissimus dorsi muscles:
*Pectoralis Major*
Instead of moving the arm, its reverse action pulls the *thorax* (ribcage) toward the humerus.
For example, in activities like climbing or using crutches, when the arms are fixed, the pectoralis major assists in lifting the ribcage for stabilization or respiration.
*Latissimus Dorsi*
The reverse action of the latissimus dorsi pulls the *pelvis* upward toward the fixed humerus.
This is observed in movements like climbing or when hanging from a bar, aiding in trunk elevation.
These reverse actions highlight how these muscles adapt their functions depending on whether the origin or insertion point is fixed during a movement.
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