What is radial muscle?
The radial nerve is a nerve in the human body that supplies the posterior portion of the upper limb. It innervates the medial and lateral heads of the triceps brachii muscle of the arm, as well as all 12 muscles in the posterior osteofascial compartment of the forearm and the associated joints and overlying skin.
Where are the radial muscles?
lateral forearm
The radial musculature consists of three muscles located at the lateral forearm. They all run from or near the lateral epicondyle of the humerus to the wrist. As their bellies and tendons lie superficially, they can be easily palpated.
What happens when the radial muscles?
In bright light, the circular muscles contract whilst the radial muscles relax. This causes the pupil to constrict and less light enters the eye. In dim conditions the opposite occurs. The circular muscles relax and the radial muscles contract, causing the pupil to dilate and allowing more light to pass into the eye.
What is the meaning of radials?
1 : arranged or having parts arranged like rays. 2a : relating to, placed like, or moving along a radius. b : characterized by divergence from a center. 3 : of, relating to, or adjacent to a bodily radius. 4 : developing uniformly around a central axis.
Where is ciliary muscle?
The ciliary muscle is elongated, triangular in shape, and located beneath the anterior sclera just posterior to the limbus. The shortest side of the triangular region faces anterior-inward and it is to this region of the ciliary body that the base of the iris inserts.
What are the forearm muscles?
They are pronator teres, flexor carpi radialis, palmaris longus, and flexor carpi ulnaris. The intermediate group contains only one muscle, flexor digitorum superficialis (image 2).
What is pupil?
The pupil of the eye is the black circle in the center of the iris. The iris is the colored portion of the eye with a structure and color unique to each person. The pupil of the eye is a portal which admits and regulates the flow of light to the retina. This is part of the process which allows us to perceive images.
What nerve dilates the pupil?
Therefore, the oculomotor nerve is responsible not only for a wide variety of eye movements but also for pupillary constriction and lens accommodation. A variety of pathologies may affect this nerve, but it will result in ptosis, the eye rotated downward and outward and with a fixed, dilated pupil.
What happens when bright light hits the eye?
This is the colored part of your eye responsible for reducing and enlarging the size of your pupil. When intense light rays reach your eye, the iris responds by constricting the pupil, thus protecting the retina and helping it process the incoming image better.
What is radial anatomy?
Anatomical terms of bone The radius or radial bone is one of the two large bones of the forearm, the other being the ulna. It extends from the lateral side of the elbow to the thumb side of the wrist and runs parallel to the ulna.
What is difference between radial and axial?
Axial is the direction along the long axis of the wood, radial is the direction along a radius of the circular trunk cross-section, and tangential is the direction that is at right angles to the radial direction.
What are ciliary muscles?
Ciliary muscle: A circular muscle that relaxes or tightens the zonules to enable the lens to change shape for focusing. The zonules are fibers that hold the lens suspended in position and enable it to change shape during accommodation.
What is the function of the radial muscles?
Function. In contrast, both the extensor carpi radialis longus and brevis are rather poor flexors of the elbow. Their main function is the dorsal extension and radial abduction of the wrist joint (hand deviation). They also contribute to a strong fist closure by previously stretching the flexor muscles of the hand and fingers.
What is the meaning of the word radiale?
1. radiating; spreading outward from a common center. 2. pertaining to a radius. 3. pertaining to the radial (lateral) aspect of the arm as opposed to the ulnar (medial) aspect. radial artery an artery in the forearm, wrist, and hand; the one usually used for taking the pulse.
Where are the radial muscles of the forearm located?
Brachioradialis muscle. This muscle originates at the lateral supracondylar ridge (between the brachialis and lateral head of the triceps) and the lateral intermuscular septum of the humerus and inserts at the styloid process of the radius.
What are the muscles that attach to the radius?
Supinator, flexor pollicis longus and the flexor digitorum superficialis attach to the upper third part of the shaft of the radius. Extensor Pollicis Brevis muscle, abductor pollicis longus muscle, and pronator teres all attach to the mid shaft of the radius