Appendicular Muscles of the Pectoral Girdle and Upper Limbs.docx

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Appendicular Muscles of the Pectoral Girdle and Upper LimbsIntroductionEstimated time to complete: 40 minutesThe muscles of the pectoral girdle and upper limb includes muscles that position the pectoral girdle inorder to support the arm as well as muscles that will attach to the humerus and move the arm. Someexamples of these muscles are the trapezius, rhomboids, pectoralis and latissimus dorsi muscles. Therotator cuff is also essential to the stability of the glenohumeral joint which is formed from the tendonsof four muscles that all originate on the scapula. Working distally are the muscles that move the forearmat the elbow like the biceps brachii, brachialis and triceps brachii muscles. The muscles that move thewrist, hand and fingers originate in the forearm and insert into the wrist or hand. These muscles aredivided between the anterior forearm and the posterior forearm. The intrinsic muscles of the handoriginate and insert in the hand and function in the precise movements of the hand like writing andtyping. In this topic, you will explore the muscles that position the pectoral girdle, discover muscles thatmove the upper limb, and examine the intrinsic muscles of the hand.This topic addresses the following objectives:Identify anatomical characteristics in each of the organ systems.Summarize major physiological functions in each of the organ systems.Explain the interrelationships between body systems.Correlate physiological events and imbalances to chemical and cellular processes.Explore: Muscles That Position the Pectoral GirdleMuscles that position the pectoral girdle are located either on the anterior thorax or onthe posterior thorax. The anterior muscles include thepectoralismusclesandserratus anterior.The posterior muscles include
thetrapeziusandrhomboid muscles. When the rhomboids are contracted, yourscapula moves medially, which can pull the shoulder and upper limb posteriorly.In this image: The muscles that stabilize the pectoral girdle make it a steady base onwhich other muscles can move the arm. Note that the pectoralis major and deltoid,which move the humerus, are cut here to show the deeper positioningmuscles. (Openstax, Anatomy & Physiology, 2017).MovementTargetPrime MoverMoves arm from side of body to front of body; assists withinhalationScapula; ribsSerratus anteriorElevates shoulders (shrugging); pulls shoulder blades together; tiltshead backwards (extension of neck)Scapula;cervical spineTrapeziusStabilizes scapula during pectoral girdle movementScapulaRhomboidmajor and minorWatch: Shoulder (Pectoral) Girdle – Muscles and MovementsDirections: Observe the muscles and movements of the pectoral girdle while viewing this video.

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Term
Spring
Professor
Pierson
Tags
Muscles of the upper limb, Target Forearm, Appendicular Muscles of the Pectoral Girdle

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