General Anatomy: (Part 6) MUSCLES - Attachment of Skeletal Muscles, Action of Muscles

Описание: 📌 𝐅𝐨𝐥𝐥𝐨𝐰 𝐨𝐧 𝐈𝐧𝐬𝐭𝐚𝐠𝐫𝐚𝐦:-   / drgbhanuprakash  
📌𝗝𝗼𝗶𝗻 𝗢𝘂𝗿 𝗧𝗲𝗹𝗲𝗴𝗿𝗮𝗺 𝗖𝗵𝗮𝗻𝗻𝗲𝗹 𝗛𝗲𝗿𝗲:- https://t.me/bhanuprakashdr
📌𝗦𝘂𝗯𝘀𝗰𝗿𝗶𝗯𝗲 𝗧𝗼 𝗠𝘆 𝗠𝗮𝗶𝗹𝗶𝗻𝗴 𝗟𝗶𝘀𝘁:- https://linktr.ee/DrGBhanuprakash

*Muscles: Attachment and Action*

*1. Introduction to Muscles*
Muscles are contractile tissues responsible for movement, stability, and posture in the body.
They are classified as skeletal, smooth, and cardiac muscles.
Skeletal muscles are attached to bones and play a crucial role in voluntary movements.

*2. Attachment of Skeletal Muscles*
Skeletal muscles attach to bones via tendons, which are tough, fibrous connective tissues.
Tendons connect muscles to bones, allowing for the transmission of force generated by muscle contraction to move bones.
Muscle attachment occurs at specific sites on bones called insertion and origin points.

*3. Insertion and Origin Points*
*Origin:* The point where the muscle attaches to the stationary bone. During contraction, the origin remains relatively fixed.
Example: The origin of the biceps brachii muscle is the scapula (shoulder blade).
*Insertion:* The point where the muscle attaches to the movable bone. During contraction, the insertion moves toward the origin.
Example: The insertion of the biceps brachii muscle is the radius bone in the forearm.

*4. Action of Muscles*
The action of a muscle refers to the movement it produces when it contracts.
Muscles can produce various types of movements, including flexion, extension, abduction, adduction, and rotation.

*5. Types of Muscle Actions*
*Flexion:* Decreases the angle between two body parts.
Example: Bending the elbow is a result of flexion produced by the biceps brachii muscle.
*Extension:* Increases the angle between two body parts.
Example: Straightening the knee is a result of extension produced by the quadriceps femoris muscle.
*Abduction:* Moves a body part away from the midline of the body.
Example: Raising the arm sideways is a result of abduction produced by the deltoid muscle.
*Adduction:* Moves a body part toward the midline of the body.
Example: Bringing the arm back to the side of the body is a result of adduction produced by the latissimus dorsi muscle.
*Rotation:* Turns a bone around its own axis.
Example: Rotating the head from side to side is a result of rotation produced by the sternocleidomastoid muscle.

*6. Mechanisms of Muscle Action*
Muscle contraction is initiated by nerve impulses that travel along motor neurons to the neuromuscular junction.
At the neuromuscular junction, the nerve impulse triggers the release of neurotransmitters (acetylcholine), which stimulate muscle fibers to contract.
The sliding filament theory explains the mechanism of muscle contraction, where actin filaments slide over myosin filaments, shortening the sarcomeres and producing muscle contraction.
ATP (adenosine triphosphate) provides energy for muscle contraction by breaking down into ADP (adenosine diphosphate) and releasing energy.
Calcium ions play a crucial role in muscle contraction by binding to troponin, which exposes the active sites on actin filaments for myosin binding.

*7. Clinical Relevance*
Understanding muscle attachment and action is crucial in diagnosing and treating musculoskeletal injuries and disorders.
Knowledge of muscle function is essential for rehabilitation exercises and physical therapy interventions.
In-depth understanding of muscle mechanics is vital for surgical procedures involving muscle manipulation and repair.

*8. Conclusion*
Mastery of muscle attachment and action is fundamental for understanding human anatomy and physiology.
Proficiency in this area is indispensable for clinical practice in various medical specialties, particularly orthopedics, sports medicine, and rehabilitation.
Continual learning and application of muscle biomechanics enhance the ability to diagnose, treat, and prevent musculoskeletal disorders, contributing to improved patient outcomes.

#fmge #fmgevideos #rapidrevisionfmge #fmgejan2023 #mbbslectures #nationalexitexam #nationalexittest #neetpg #usmlepreparation #usmlestep1 #fmge #usmle #drgbhanuprakash #medicalstudents #medicalstudent #medicalcollege #neetpg2023 #usmleprep #usmlevideos #usmlestep1videos #medicalstudents #neetpgvideos #