The shoulder, or pectoral, girdle is composed of the clavicles (collarbones) and the scapulae (shoulder blades). In humans the clavicles join the sternum (breastbone
Which joints attach the pectoral girdle to the trunk?
- Sternoclavicular joint. This joint is the point where your clavicle meets your sternum. ...
- Scapulothoracic joint. Also known as the scapulocostal joint, this is where the scapula bone meets the ribs in the back of your chest. ...
- Acromioclavicular joint. ...
- Glenohumeral joint.
Where does the pectoral girdle attach?
The pectoral girdle, consisting of the clavicle and the scapula, attaches each upper limb to the axial skeleton . The clavicle is an anterior bone whose sternal end articulates with the manubrium of the sternum at the sternoclavicular joint.
How is the pectoral girdle attached to the axial skeleton?
It is attached on its medial end to the sternum of the thoracic cage , which is part of the axial skeleton. The lateral end of the clavicle articulates (joins) with the scapula just above the shoulder joint. You can easily palpate, or feel with your fingers, the entire length of your clavicle.
What does the pectoral girdle articulate with?
The pectoral attach the bones of the upper limbs to the axial skeleton. Each of the two pectoral girdles consists of a clavicle and a scapula. The clavicle, the ANTERIOR bone, articulates with the manubrium of the sternum ; the scapula, the POSTERIOR bone, articulates with the clavicle and with the humerus.
Which bone is part of the pectoral girdle?
The shoulder, or pectoral, girdle is composed of the clavicles (collarbones) and the scapulae (shoulder blades) . In humans the clavicles join the sternum (breastbone) medially and the scapulae laterally; the scapulae, however, are joined to the trunk only by muscles.
What attaches the scapula to the trunk of the body?
The clavicle, or collarbone , is a slender s-shaped bone that extends between the sternum and the scapula and is located directly above the first rib. It functions to attach the upper arm to the trunk and provides support to allow free movement around the shoulder.
Where does the pectoral girdle attach to the axial skeleton quizlet?
The pectoral (shoulder) girdles attach the bones of the upper extremities to the axial skeleton. Each girdle consists of a clavicle and a scapula.
How do the pectoral and pelvic girdles serve as attachment points?
Key Points
The bones of the pectoral girdle anchor the upper limb to the thoracic cage of the axial skeleton. The pelvic girdle is formed by a single bone and serves as the attachment point for each lower limb .
What bones form the pelvic girdle?
In discussing the pelvis, a distinction can be made between the “pelvic spine” and the “pelvic girdle.” The pelvic girdle, also known as the os coxae, Latin for “bone of the hip,” consists of the fused bones identified individually as the ilium, ischium, and pubis .
Where does the pectoral girdle attach to the axial skeleton chegg?
The pectoral girdle attaches to the sternal manubrium of the axial skeleton via the medial end of its clavicle.
How are the upper limbs attached to the axial skeleton?
The shoulder girdle connects the bones of the upper limbs to the axial skeleton. These bones also provide attachment for muscles that move the shoulders and upper limbs.
Where does the pectoral girdle attach to the appendicular skeleton?
The shoulder girdle or pectoral girdle is the set of bones in the appendicular skeleton which connects to the arm on each side . In humans it consists of the clavicle and scapula; in those species with three bones in the shoulder, it consists of the clavicle, scapula, and coracoid.
How is the scapula attached to the posterior wall of the thorax?
The ventral surface of the scapula abuts the thoracic rib cage and has a large concavity called the subscapular fossa where the subscapularis attaches. ... The dorsal surface divides into two unequal parts via the scapular spine which runs across from the posterior scapula before forming the acromion.
How is the pectoral girdle formed?
The pectoral girdle is made up by the scapula and paired clavicles . The only direct attachment to the axial skeleton is the sternoclavicular ligament (Cruise and Brewer, 1994). The other major attachments are via the musculature. The humerus, radius, and ulna are typical of the mammalian family.
Which of the following muscles of the pectoral girdle insert on the clavicle?
Direct attachment of the pectoral girdle to the trunk is provided by muscles that are inserted into the clavicle or scapula from the axial skeleton. These muscles are pectoralis minor, subclavius, trapezius, the rhomboids, levator scapulae and serratus anterior .
Where does the humerus articulate on the pectoral girdle quizlet?
The scapula has a glenoid cavity that is the site of articulation with the humerus in the pectoral girdle.
What joint attaches the pectoral girdle and the upper limbs?
The medial end, known as the sternal end of the clavicle, has a triangular shape and articulates with the manubrium portion of the sternum. This forms the sternoclavicular joint , which is the only bony articulation between the pectoral girdle of the upper limb and the axial skeleton.
What joint connects the collar bone to the breast bone?
Anatomy and Orthopaedic Surgery
sternoclavicular joint : at the junction of the clavicle and breast bone. humerus: arm bone between the shoulder and elbow.
Why is the pectoral girdle less sturdy than the pelvic girdle?
The pectoral girdle is weaker than the pelvic girdle because the pelvic girdle is the primary weight-bearing and locomotion structure for the body ...
Where does the humerus articulate with the pectoral girdle?
At the acromioclavicular joint, the scapula’s acromion area articulates with the clavicle. The glenoid cavity, a shallow cavity shaped in the scapula where the humerus articulates with the pectoral girdle, is located inside the lateral angle.
What are the function of the pectoral girdle quizlet?
This part of the skeleton wraps around the upper portion of the thoracic cage. It serves as the support structure for the upper limb . It includes the clavicles and scapulae.
Is the pectoral girdle a shallow socket?
The pectoral girdle does not directly articulate with the vertebral column; the pelvic girdle does. B. The pectoral girdle sockets are shallow and maximize movement ; those of the pelvic girdle are deeper and allow less movement.
What is pectoral girdle and pelvic girdle?
The pectoral girdle stabilizes the upper limbs on the thorax and allows a range of mobility at the shoulder. ... The pelvic girdle transfers upper body weight to the lower limbs by articulating with the spine.
Where is the area that connects the axial skeleton and attaches to the pelvic girdle and the appendicular skeleton of the lower extremity?
The pelvic girdle is formed by a single hip bone. The hip bone attaches the lower limb to the axial skeleton through its articulation with the sacrum . The right and left hip bones, plus the sacrum and the coccyx, together form the pelvis.
How are the pelvic bones connected?
The pelvis consists of paired hipbones, connected in front at the pubic symphysis and behind by the sacrum ; each is made up of three bones—the blade-shaped ilium, above and to either side, which accounts for the width of the hips; the ischium, behind and below, on which the weight falls in sitting; and the pubis, in ...
Which bones form the pectoral girdle do these bones articulate with vertebrae or ribs?
The human body has a left and right pectoral girdle, each containing two bones, the scapula (shoulder blade) and clavicle (collar bone). The scapulae articulate medially with the vertebral column and laterally with the clavicle and the humerus bone.
Is the tibia axial or appendicular?
The appendicular skeleton is everything else. It’s everything that attaches on to the axial skeleton. Think “appendages”. The pelvis, femur, fibula, tibia and all of the foot bones as well as the scapula, clavicle, humerus, radius, ulna and all of the hand bones are classified as appendicular.
Which bones make up the pectoral girdle and free upper limb?
The bones that attach each upper limb to the axial skeleton form the pectoral girdle (shoulder girdle). This consists of two bones, the scapula and clavicle ((Figure)).
What is the relationship of the Locomotory motion to the attachment of the pelvic girdle to the axial skeleton?
The pelvic girdle attaches to the lower limbs of the axial skeleton. Since it is responsible for bearing the weight of the body and for locomotion, the pelvic girdle is securely attached to the axial skeleton by strong ligaments .
Why is the pectoral girdle an incomplete ring?
The pectoral girdle is an incomplete ring because it is open in the back between the ... The medial ends of the clavicles areticulate with the what of the sternum? The lateral ends of the clavicles areticulate with the what of the scapulae? ... This divides the scapula into unequal portions.
What attaches humerus to axial skeleton?
Muscles That Move the Humerus
Similar to the muscles that position the pectoral girdle, muscles that cross the shoulder joint and move the humerus bone of the arm include both axial and scapular muscles ([link] and [link]). The two axial muscles are the pectoralis major and the latissimus dorsi .
What muscles attach the scapula to the thorax?
The serratus anterior muscle pulls the scapula forward around the thorax, which allows for anteversion and protraction of the arm.
What are the muscles attached to the scapula?
The scapula provides attachment to several groups of muscles. The intrinsic muscles of the scapula include the rotator cuff muscles, teres major, subscapularis, teres minor, and infraspinatus .
How is the shoulder blade attached?
The scapula and arm are connected to the body by multiple muscle and ligament attachments . The front of the scapula (acromion) is also connected to the clavicle (collarbone) through the acromioclavicular joint.
