Músculos de los BRAZOS y MANOS
Main Muscles of the Upper Limbs
In this section, the video discusses the main muscles of the upper limbs, focusing on the shoulders, arms, forearms, hands, and fingers.
Shoulders and Trunk Muscles
- The shoulders contain various muscles divided into anterior and posterior groups. These muscles contribute to shoulder mobility along with trunk muscles like pectoral major, pectoral minor, dorsal wide, trapezius, and sternocleidomastoid.
- The deltoid muscle in the posterior dorsal side of the shoulder is triangular and robust. It aids in arm elevation and rotation. The subscapularis muscle on the ventral side helps rotate the arm inward.
Arms
- Moving to the arms, key muscles include biceps brachii and triceps brachii which are antagonistic - one contracts while the other relaxes. The biceps elevates the arm and flexes the elbow while anchoring at different points on the scapula and radius.
- The triceps extends the forearm and lowers the arm. It acts on two joints - raising the entire arm forward and bending at the elbow to lift the forearm.
Forearms
- There are 19 muscles in this part responsible for hand movement, finger flexion/extension. Examples include pronator teres for forearm flexion/pronation; supinator for palm rotation upwards; palmaris longus for wrist/hand flexion; deep finger flexors for finger/wrist flexion.
Hands and Fingers
- Hand muscles focus on moving fingers - flexing/extending them including a significant muscle called opponens pollicis aiding thumb movements like grasping objects effectively.
Conclusion & Next Steps
The video concludes by inviting viewers to explore lower limb muscles in future videos while encouraging engagement through likes, shares, subscriptions for more content access or becoming a patron via Patreon for exclusive benefits.