The pectoral girdle is made up of two major bones: the clavicle and scapula .
What are the bones of the pectoral and pelvic girdles?
The appendicular skeleton consists of the pectoral and pelvic girdles, the limb bones, and the bones of the hands and feet. The pectoral girdle consists of the clavicle and the scapula , which serve to attach the upper limb to the sternum of the axial skeleton.
What is the longest bone of the pectoral girdle?
The humerus is the largest and longest bone of the upper limb and the only bone of the arm. It articulates with the scapula at the shoulder and with the forearm at the elbow.
Which bone does the pectoral girdles not articulate?
THE PECTORAL GIRDLES DO NOT ARTICULATE WITH THE VERTEBRAL COLUMN AND ARE HELD IN POSITION AND STABILIZED BY A GROUP OF LARGE MUSCLES THAT EXTEND FROM THE VERTEBRAL COLUMN AND RIBS TO THE SCAPULA. The shoulder girdle is very light and allows the upper limb to have free movement.
What is the pectoral girdle in fish?
Pectoral girdle. In a cartilaginous fish, such as the dogfish, the pectoral girdle consists of a U-shaped endoskeletal, cartilaginous, inverted arch with its ends extending dorsally . ... It consists of endoskeletal structures to which secondary dermal components are added as the result of ossification of dermal elements.
What is the difference between 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 .
What are the five muscles of the pectoral girdle?
The five muscles that comprise the function of the shoulder girdle are the trapezius muscle (upper, middle, and lower), levator scapulae muscle, rhomboid muscles (major and minor), serratus anterior muscle, and pectoralis minor muscle .
Do children have more bones than adults?
Babies have more bones than adults .
By the time you're a grownup, you've only got 206. The reason: As babies grow, some of their bones fuse together. Some infant bones are made entirely of soft, flexible tissue called cartilage that's slowly replaced by hard bone as the baby develops.
Why is the pectoral girdle weak?
The pectoral girdle is weaker than the pelvic girdle because the pelvic girdle is the primary weight-bearing and locomotion structure for the body...
Which is the smallest bone in human body?
At 3 mm x 2.5 mm, the “stapes” in the middle ear is the smallest named bone in the human body. The shape of a stirrup, this bone is one of three in the middle ear, collectively known as the ossicles.
How is the pectoral girdle attached to the trunk?
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 organ does the scapula protect?
The scapula stabilizes the arm and neck
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 limbs are attached to the pectoral girdle?
The pectoral girdle consists of the clavicle and the scapula , which serve to attach the upper limb to the sternum of the axial skeleton. The scapula (shoulder blade) lies on the posterior aspect of the shoulder.
What is the function of the pectoral girdle in fish?
Thus, the pectoral girdle is clearly a dual-function structure in these fishes: supporting the pectoral fins in locomotion, and contributing to mouth expansion and transmitting hypaxial muscle power during suction feeding .
Where is the pectoral girdle in fish?
THE SKELETON | Cartilaginous Fish Skeletal Anatomy
The pectoral girdle is positioned just posterior to the neurocranium . The paired halves of the pectoral girdle are fused at the symphysis. The ventralmost portion of the pectoral girdle is the coracoid region. The dorsal portion is the elongate scapular process.
What is meant by a paired girdle?
The pectoral girdle (shoulder girdle) is composed of a clavicle and scapula; the paired girdles do not form a complete ring as the term girdle implies. ... Clavicles articulate with the sternum of the axial skeleton as well as the scapulae. Additionally, a ligament runs from the clavicle to the first rib.
