Interactive Biology

In this video, the motion of finger flexion is occurring at the metacarpophalangeal (MCP) and interphalangeal (IP) joints. This motion is controlled by concentric muscle contraction. Concentric metacarpophalangeal (MCP) and interphalangeal (IP) joint flexion is demonstrated starting with the arm at the side of the body and the palm facing forward in the anatomical position for the upper extremity and ending in a fully flexed position as seen from a side or lateral view.

In this video, the motion of the fingers beings at the extrinsic plus position with metacarpophalangeal (MCP) joint extension and interphalangeal (IP) joint flexion. The motion ends in the intrinsic plus position with metacarpophalangeal (MCP) joint flexion and interphalangeal (IP) joint extension as seen from a side or lateral view.

In this video, the motion of bringing the fingers together is adduction. Adduction is occurring at the metacarpophalangeal joints. Metacarpophalangeal adduction is demonstrated from a position of the fingers being spread apart to a position of full adduction as seen from a front or anterior view.

In this video, the motion of spreading apart the fingers is abduction. Abduction is occurring at the metacarpophalangeal joints. Metacarpophalangeal abduction is demonstrated from a position of the fingers being close together to a position of full abduction as seen from a front or anterior view.

In this video, the motion of finger extension is occurring at the metacarpophalangeal and interphalangeal joints. This motion is controlled by eccentric muscle contraction. Eccentric metacarpophalangeal and interphalangeal joint extension is demonstrated from a fully flexed hand position as seen from a side or lateral view.

In this video, the motion of bringing the thumb across the palm is flexion. The motion of flexion is occurring at the 1st carpometacarpal (CMC) joint of the thumb. 1st CMC flexion is demonstrated from a position with the thumb in a neutral resting location to a position with the thumb moving as far across the palm as possible as seen from a side or lateral view.

In this video, the motion of bringing the thumb away from the palm is abduction. The motion of abduction is occurring at the 1st carpometacarpal (CMC) joint of the thumb. 1st CMC abduction is demonstrated from a position with the thumb resting on the palm to a position of the thumb moving as far away from the palm as possible as seen from a front or anterior view.

In this video, the action of flexing the wrist with resistance is a concentric muscle contraction. Concentric wrist flexion is demonstrated from a neutral wrist position to a fully flexed wrist position as seen from a front or anterior view.

In this video, the action of controlling the extension of the wrist from a fully flexed position is an eccentric muscle contraction. The motion occurring at the wrist is eccentric wrist extension. Eccentric wrist extension is demonstrated from a side or lateral view.

In this video, the motion of moving the wrist to the outside/laterally is wrist radial deviation. Wrist radial deviation is demonstrated from a position with the arm at the side of the body and the palm facing forward which is the anatomical position for the upper extremity as seen from a front or anterior view.

In this video, the action of controlled lowering of the weight is an eccentric muscle contraction. The motion of moving from a neutral position to a palm up position is forearm supination. Eccentric forearm supination is demonstrated with the elbow bent to 90⁰ of flexion starting from a neutral position and ending in a fully supinated wrist position as seen from a front or anterior view.

In this video, the motion of moving the forearm from palm down to a neutral position is called concentric supination. Supination is demonstrated with the elbow bent to 90⁰ starting from a fully pronated position and ending in a neutral wrist position as seen from a front or anterior view.

In this video, the action of controlled lowering of the weight is an eccentric muscle contraction. The motion of the forearm from neutral to a palm down position is called forearm pronation. Eccentric forearm pronation is demonstrated with the elbow bent to 90⁰ as seen from a front view.

http://www.interactive-biology.com/107 - In this video, I go over the content I covered in the last 2 videos. I basically review the muscles, innervation and functions of the muscles of the anterior forearm. This is a good review video, but I would highly recommend for you to watch the last two videos for more details.

In this video, the action of controlled lowering of the weight is an eccentric muscle contraction. The motion occurring at the elbow is extension and it is demonstrated starting from a fully flexed elbow and ending with the elbow straight. The ending position of the arm at the side of the body and the palm facing forward is the anatomical position for the upper extremity as seen from a side or lateral view.

In this video, the motion of turning the forearm outward or laterally is called supination. Supination is demonstrated from a neutral position as seen from a front or anterior view.

In this video, the motion of elbow flexion is demonstrated starting with the arm at the side of the body with the palm facing forward, which is the anatomical position for the upper extremity. This motion ends with the elbow fully bent as seen from a side or lateral view.

In this video, the action of controlled lowering of the weight is an eccentric muscle contraction. This motion at the shoulder or glenohumeral joint is internal rotation. Internal rotation is demonstrated starting with the elbow bent to 90⁰ of flexion and the arm out to the side in 90⁰ of glenohumeral abduction. The motion consists of the weight being slowly lowered into internal rotation at the shoulder as seen from a lateral view.

In this video, the motion of shoulder or glenohumeral joint is internal rotation. Internal rotation is demonstrated starting with the elbow flexed to 90⁰ and the shoulder in a neutral position. This motion ends with the shoulder fully internally rotated as seen from an anterior view.

In this video, the motion of shoulder flexion is demonstrated with resistance from an elastic band. We are looking specifically at the glenohumeral joint starting from the arm at the side of the body and ending with the arm above the head in full flexion. This motion is happening via concentric muscle activation as seen from a front or anterior view.

In this video, the motion of glenohumeral or shoulder flexion is demonstrated starting from the arm at the side of the body with the palm facing forward, which is the anatomical position for the upper extremity, and ending with the arm above the head in full flexion as seen from a front or anterior view.

In this video, the controlled motion of bringing the arm down to the side is eccentric shoulder adduction. Eccentric shoulder adduction is demonstrated starting with the arm up above the head in full abduction and ending with the arm at the side with the palm facing forward which is the anatomical position for the upper extremity as seen from a back or posterior view.

In this video, the motion at the shoulder being viewed is scapular protraction. Scapular protraction is demonstrated starting from 90ᵒ of glenohumeral (shoulder) flexion and ends once the arm is in its fully forward position as seen from a side or anterior-medial view.

In this video, the motion of bringing arm down to side is shoulder adduction. Shoulder adduction is demonstrated starting with the arm up above the head in full abduction and ending with the arm at the side with the palm facing forward which is the anatomical position for the upper extremity as seen from a front or anterior view

In this video, the motion of bringing the arm across the chest is called shoulder or glenohumeral horizontal adduction. Glenohumeral horizontal adduction is demonstrated starting from 90ᵒ of shoulder flexion with the arm slightly away from midline in abduction as seen from a front or anterior view.