Each head of the deltoid muscle also plays a role in the stabilization of the glenohumeral joint which serves to improve the smoothness and overall quality of arm movement. The glenohumeral joint, consisting of the scapula and humerus, relies on upper arm musculature for stabilization and overall maintenance of the joint integrity.
The deltoid is a muscle, with motor function as its sole and primary job. Motor function which the deltoid is responsible for includes shoulder abduction, shoulder flexion, and shoulder extension which allows the shoulder to stay at its resting position while also giving the option of backward movement.
The motions enabled by the deltoid muscle play a large role in the overall use of the arm in daily tasks. The deltoid muscle serves no sensory function, though nerves and arteries which run through it allow for its oxygenation and movement.
Therefore, severe injury to the deltoid muscle may indirectly cause injury to the underlying nerves and arteries which run through or are adjacent to the deltoid.
Conditions associated with the deltoid often are related to injury of the deltoid muscle or adjacent muscles with similar functions. Muscles in the upper arm region include the supraspinatus, infraspinatus, teres minor, and subscapularis together known as the rotator cuff. The most common injury to this group of muscles as a whole is a rotator cuff tear.
This may place undue mechanical stress on the deltoid muscle, which can cause a muscle sprain if it continues over a long period of time. More specific to the deltoid muscle is its integration within the entire arm, as this plays a role in surgical approaches. Due to the frontal placement of the anterior head of the deltoid, this muscle is an important consideration when surgeons choose an approach which involves access through the front of the arm.
Surgeries such as open capsular reconstructions for frontal shoulder instability, shoulder replacement surgeries, biceps tendon repairs, and rotator cuff repair surgeries all may utilize the deltopectoral approach. The deltopectoral approach uses fibers and anatomical landmarks from the deltoid and pectoralis major muscles to guide surgical incisions.
Both frontal and side approaches to surgery include the splitting of deltoid muscle fibers followed by fibers being sewn back together. Any of these approaches which include the splitting of the deltoid fibers can result in injury to the deltoid muscle. This may require some rehabilitation to the deltoid muscle along with the typical rehabilitation course specific to the surgical procedure. Due to the placement of the axillary nerve immediately below the deltoid muscle, the nerve supply to the deltoid and other upper arm muscles may also be impacted through surgery or traumatic injuries.
This nerve loss can result in a partial or complete loss of motor function to the deltoid muscle, along with the other muscles the axillary nerve supplies. Motor loss would also be accompanied by loss of sensation to the deltoid muscle, depending on the severity of the nerve loss.
The cephalic vein runs adjacent to the deltoid muscle and assists with circulation and fluid management. An injury of any kind to the cephalic vein can result in fluid buildup to the upper arm. If not addressed immediately and properly, fluid buildup can lead to a host of other complications, including skin changes, loss of blood flow, nerve damage, loss of muscle strength, and more. Rehabilitation of the deltoid muscle looks much the same as rehabilitation of most large muscles of the arm.
If someone has surgery on the deltoid muscle or even an injury which requires extensive rehabilitation, treatment of the deltoid will typically follow a specific protocol. This protocol will vary slightly based on the injury which occurred and whether surgery was performed.
Most protocols require an individual to wear a brace which immobilizes the arm for two to three weeks. While the arm is immobilized, an occupational or physical therapist will provide either active or passive motion to the joints below the upper arm. This includes the elbow, wrist, and fingers to ensure movement is maintained throughout the entire arm.
Lack of motion to these joints can cause muscle weakness, resulting in an overall lengthened rehabilitation period. The muscles push the food back out of the stomach so it comes up through the esophagus say: ih-SAH-fuh-gus and out of the mouth. Smooth muscles are also found in your bladder. When they're relaxed, they allow you to hold in urine pee until you can get to the bathroom.
Then they contract so that you can push the urine out. These muscles are also in a woman's uterus, which is where a baby develops. There they help to push the baby out of the mother's body when it's time to be born.
You'll find smooth muscles at work behind the scenes in your eyes, too. These muscles keep the eyes focused. The muscle that makes up the heart is called cardiac muscle. It is also known as the myocardium say: my-uh-KAR-dee-um. The thick muscles of the heart contract to pump blood out and then relax to let blood back in after it has circulated through the body.
Just like smooth muscle, cardiac muscle works all by itself with no help from you. A special group of cells within the heart are known as the pacemaker of the heart because it controls the heartbeat. Now, let's talk about the kind of muscle you think of when we say "muscle" — the ones that show how strong you are and let you boot a soccer ball into the goal.
These are your skeletal muscles — sometimes called striated say: STRY-ay-tud muscle because the light and dark parts of the muscle fibers make them look striped striated is a fancy word meaning striped.
Skeletal muscles are voluntary muscles, which means you can control what they do. Your leg won't bend to kick the soccer ball unless you want it to. These muscles help to make up the musculoskeletal say: mus-kyuh-low-SKEL-uh-tul system — the combination of your muscles and your skeleton, or bones. The deltoid muscle is a rounded, triangular muscle located on the uppermost part of the arm and the top of the shoulder. It is named after the Greek letter delta, which is shaped like an equilateral triangle.
The deltoid is attached by tendons to the skeleton at the clavicle collarbone , scapula shoulder blade , and humerus upper arm bone. The deltoid is widest at the top of the shoulder and narrows to its apex as it travels down the arm. Contraction of the deltoid muscle results in a wide range of movement of the arm at the shoulder due to its location and the wide separation of its muscle fibers.
These fibers are connected by a very thick tendon and are anchored into a V-shaped channel. This channel housed in the shaft of the humerus bone in the arm. The deltoid muscle is responsible for the brunt of all arm rotation and allows a person to keep carried objects at a safer distance from the body.
It is also tasked with stopping dislocation and injury to the humerus when carrying heavy loads. One of the most common injuries to the deltoid muscle is a deltoid strain. Deltoid strain is characterized by sudden and sharp pain where injured, intense soreness and pain when lifting the arm out from the side of the body, and tenderness and swelling caused by and located at the deltoid muscle. The supraspinatus muscle is a rotator cuff muscle located in the shoulder, specifically in the supraspinatus fossa, a concave depression in the rear….
The quadratus plantae is a muscle in the foot that extends from the anterior front of the calcaneus heel bone to the tendons of the digitorum…. The depressor labii inferioris muscle is a four-sided facial muscle located in the jaw area that draws the lower lip down and to the side.
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