muscle origin and insertion pdf

Muscle Origin And Insertion Pdf

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There are over muscles in the human body. Learning the muscular system often involves memorizing details about each muscle, like where a muscle attaches to bones and how a muscle helps move a joint. In textbooks and lectures these details about muscles are described using specialized vocabulary that is hard to understand. Here is an example: The triceps brachii has three bellies with varying origins scapula and humerus and one insertion ulna.

Human muscle system

The muscles of the upper limb can be divided into 6 different regions: pectoral, shoulder, upper arm, anterior forearm, posterior forearm, and the hand. There are 4 muscles of the pectoral region : pectoralis major, pectoralis minor, serratus anterior and subclavius.

Collectively, these muscles are involved in movement and stabilisation of the scapula, as well as movements of the upper limb. The muscles of the shoulder joint can be divided into an intrinsic and extrinsic group; The extrinsic group originate from the torso and attach to the bones of the shoulder, whereas the intrinsic ones originate from the bones of the shoulder and attach the humerus.

They collectively act to move the upper arm and stabilise the shoulder joint. The upper arm, located between the shoulder and elbow joint, has an anterior and posterior compartment. The muscles located in the anterior compartment are involved in flexion at the elbow and shoulder joint whereas muscle in the posterior compartment, triceps brachii, extends the arm at the elbow joint.

The muscles of the forearm are subdivided into an anterior and posterior compartment. The muscles of the anterior compartment are further divided into a superficial, intermediate and deep layer; Innervated by both the ulnar and median nerve, they collectively act to pronate the forearm and to flex the wrist and the digits. The muscles of the posterior compartmen t are separated into a superficial and deep layer.

These muscles are innervated by the radial nerve and are known as the extensor muscles due to their general action of extending the wrist and the digits.

The muscles of the hand can be divided into an extrinsic and intrinsic group. The extrinsic group originate from the forearm and attach to the bones of the hand, they are associated with forceful or non-precise movements.

On the other hand, the intrinsic group originate and attach within the hand itself and are more involved with fine-tuned and delicate movements. Both groups are innervated by the ulnar and median nerve. In this section, learn more about the anatomy of the muscles of the upper limb…. Once you've finished editing, click 'Submit for Review', and your changes will be reviewed by our team before publishing on the site.

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Muscles of the Pectoral Region. Muscles of the Shoulder Region. Muscles of the Upper Arm. Muscles in the Anterior Compartment of the Forearm. Muscles in the Posterior Compartment of the Forearm. Anatomy Video Lectures. Found an error? Is our article missing some key information? Make the changes yourself here! Don't ask me again. This website uses cookies. Close Privacy Overview This website uses cookies to improve your experience while you navigate through the website.

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11.4 Identify the skeletal muscles and give their origins, insertions, actions and innervations

Human muscle system , the muscles of the human body that work the skeletal system , that are under voluntary control, and that are concerned with movement, posture, and balance. Broadly considered, human muscle—like the muscles of all vertebrates—is often divided into striated muscle or skeletal muscle , smooth muscle , and cardiac muscle. Smooth muscle is under involuntary control and is found in the walls of blood vessels and of structures such as the urinary bladder , the intestines , and the stomach. Cardiac muscle makes up the mass of the heart and is responsible for the rhythmic contractions of that vital pumping organ; it too is under involuntary control. With very few exceptions, the arrangement of smooth muscle and cardiac muscle in humans is identical to the arrangement found in other vertebrate animals. This article is concerned with the skeletal muscles of the human body, with emphasis on muscle movements and the changes that have occurred in human skeletal musculature as a result of the long evolutionary process that involved the assumption of upright posture.

By the end of this section, you will be able to identify the following muscles and give their origins, insertions, actions and innervations:. The skeletal muscles are divided into axial muscles of the trunk and head and appendicular muscles of the arms and legs categories. This system reflects the bones of the skeleton system, which are also arranged in this manner. Some of the axial muscles may seem to blur the boundaries because they cross over to the appendicular skeleton. The first grouping of the axial muscles you will review includes the muscles of the head and neck, then you will review the muscles of the vertebral column, and finally you will review the oblique and rectus muscles.

11.4 Identify the skeletal muscles and give their origins, insertions, actions and innervations

The muscles of the upper limb can be divided into 6 different regions: pectoral, shoulder, upper arm, anterior forearm, posterior forearm, and the hand. There are 4 muscles of the pectoral region : pectoralis major, pectoralis minor, serratus anterior and subclavius. Collectively, these muscles are involved in movement and stabilisation of the scapula, as well as movements of the upper limb. The muscles of the shoulder joint can be divided into an intrinsic and extrinsic group; The extrinsic group originate from the torso and attach to the bones of the shoulder, whereas the intrinsic ones originate from the bones of the shoulder and attach the humerus. They collectively act to move the upper arm and stabilise the shoulder joint.

11.4 Identify the skeletal muscles and give their origins, insertions, actions and innervations

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 - Он выдержал паузу.  - Я, конечно, предположил, что это не та Северная Дакота, которую мы ищем, но на всякий случай проверил эту запись. Представь себе мое изумление, когда я обнаружил множество сообщений Энсея Танкадо.

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