What are the major features of the scapula?
The scapula has three angles (superior/medial, lateral, inferior), three borders (medial, lateral/axillary, and superior), and two surfaces (ventral and dorsal). The scapula has three processes: the acromion, the spine, and the coracoid process.
What does your scapula protect?
Answer and Explanation: The scapula protects the posterior (or back) of the chest, offering additional shielding to the rib cage and lungs.
What is the main function of the scapula and clavicle?
The scapula, better known as the shoulder blade, is a triangular bone that serves as a joining force between the clavicle and the humerus. This bone is located posteriorly (on the back half of the body). The scapula plays an important role in stabilizing the other bones involved in the rhythm of shoulder motion.
What is the function of the scapula quizlet?
Shoulder blade, The primary function of the scapula is to attach the upper arm to the thorax, or trunk of the body. This connection stabilizes the arm and provides for arm movement at the shoulder.
Why is scapula control important?
Normal Biomechanics Mechanically, the coordinated coupled motion between the scapula and humerus, often termed scapulohumeral rhythm, is needed for efficient arm movement and allows for glenohumeral alignment in order to maximize joint stability.
What part of shoulder is most important?
The most important muscles in your shoulder are the four rotator cuff muscles. Together with tendons, they cup the front of your shoulder and: Help you raise and rotate your arms. Provide structural support to your shoulder joint.
Where is the scapula in the body?
The scapula, or shoulder blade, is a large triangular-shaped bone that lies in the upper back.
Why scapula is called beauty bone?
It is the only horizontal long bone in our body. The clavicle forms the shoulder girdle with the shoulder blade. Its location and structure provide information about a person's body alignment. This justifies the name “beauty bone”.
What's a scapula bone?
(SKA-pyoo-luh) One of a pair of triangular bones at the back of the shoulder. The scapula connects the collarbone with the upper arm bone. Also called shoulder blade.
What is the other name for scapula?
scapula, also called shoulder blade, either of two large bones of the shoulder girdle in vertebrates.
What are the 8 movements of the scapula?
Acting in conjunction with the pectoral girdle, the shoulder joint allows for a wide range of motion at the upper limb; flexion, extension, abduction, adduction, external/lateral rotation, internal/medial rotation and circumduction.
What is the scapular plane and why is it important?
Since the rotator cuff muscles originate off the scapular, the position of the humerus in the scapular plane increases the length-tension of the deltoid and cuff muscles, helping to facilitate optimal muscle force.
Is the scapula a protective bone?
This bone is located on the posterior (back half) of the body. The scapula plays an important role in stabilizing the other bones involved in moving the shoulder and protects the posterior upper chest including the underlying nerves and blood vessels.
Is the scapula protected by muscle?
Anteriorly, the scapula is protected by the rib cage and thoracic cavity and posteriorly. It is also covered with a lot of soft tissue (i.e. muscle).
What nerves run through the scapula?
The dorsal scapular nerve branches from the ventral ramus of C5 and descends from the cervical region down to the medial border of the scapula. It innervates three muscles: the levator scapulae, the rhomboid major, and the rhomboid minor.
Why scapula is called beauty bone?
It is the only horizontal long bone in our body. The clavicle forms the shoulder girdle with the shoulder blade. Its location and structure provide information about a person's body alignment. This justifies the name “beauty bone”.
What are the different types of motions of the scapula?
It engages in 6 types of motion, which allow for full-functional upper extremity movement including protraction, retraction, elevation, depression, upward rotation, and downward rotation . Protraction is accomplished by the actions of the serratus anterior, pectoralis major, and pectoralis minor muscles. Retraction is accomplished by the actions of the trapezius, rhomboids, and latissimus dorsi muscles. The elevation is accomplished by the trapezius, levator scapulae, and rhomboid muscles. Depression is accomplished through the force of gravity and the actions of the latissimus dorsi, serratus anterior, pectoralis major and minor, and the trapezius muscles. Upward rotation is accomplished by the trapezius and serratus anterior muscles. Downward rotation is accomplished by the force of gravity as well as the latissimus dorsi, levator scapulae, rhomboids, and the pectoralis major and minor muscles. Through these six motions, the scapula allows full function of the shoulder joint, one of the most mobile and versatile joints in the human body. One example of the importance of scapular motion for the full range of motion of the upper extremity is that of the winged scapula (See Clinical Significance), in which paralysis of the serratus anterior or trapezius prohibits the raising of the upper extremity above the level of the shoulder.
What is the scapular blood supply?
The scapular blood supply is complex due to its position and role as a critical component of the shoulder joint and the necessity for adaptability. It is largely fed by an anastomosis between the axillary artery and subclavian artery known as the scapular anastomosis. Contributory arteries to this anastomosis are the dorsal scapular artery, the suprascapular artery, the deep scapular artery, the circumflex scapular branch of the subscapular artery, and the medial anastomoses with the intercostal arteries. The scapular anastomosis allows for collateral blood flow when lying supine and when using the shoulder in its multitude of positions.
What muscles attach to the surface of the bone?
The intrinsic muscles of the scapula attach directly to the surface of the bone. These muscles are the four members of the rotator cuff and act to stabilize the glenohumeral joint. These include:
What nerves are in the scapula?
The nerves to the scapula include the dorsal scapular, upper and lower subscapular, and suprascapular nerves, which arise from the brachial plexus at the anterior ramus C5 root, the posterior cord, and the superior trunk respectively. See "Muscles" section below for more details regarding specific muscle innervations.
What degree does the upper scapula rotate?
Upper fibers elevate the scapula and rotate it during abduction of the arm (90 to 180 degrees)
What is the function of the Lateral Rotation of the Arm?
Function: Lateral rotation of the arm, stabilize glenohumeral joint
When does the scapula develop?
The scapula begins osteogenic development via endochondral ossification in week 11 of human embryogenesis. This occurs shortly after week 10 of humerus development, during which it will form the glenohumeral joint.
