Definition

Noun: * In vertebrate anatomy, the pectoral girdle is the bony or cartilaginous skeletal structure that connects the upper limbs (forelimbs or arms) to the axial skeleton (the central core, including the spine and ribcage). It serves as the point of attachment and support for the muscles that move the limb.

Usage

The term is used in anatomical, zoological, and biological contexts to describe a specific part of the skeletal system. * It is a singular, countable noun. * It typically refers to the entire structure on one side (e.g., the left pectoral girdle) or collectively to both sides.

Examples

• The pectoral girdle in humans consists of the scapula (shoulder blade) and clavicle (collarbone).
• In the frog skeleton, the pectoral girdle is a robust structure that absorbs the impact of landing.
• A fracture of the pectoral girdle can significantly limit arm mobility.
• The evolution of the pectoral girdle was crucial for the transition of vertebrates from water to land.

Advanced Usage

• The pectoral girdle is often contrasted with the pelvic girdle, which attaches the lower limbs (hindlimbs or legs) to the axial skeleton.
• In comparative anatomy, the structure and composition of the pectoral girdle (e.g., presence of a coracoid, number of bones) are key features for classifying vertebrate groups.

Variants and Related Words

• Shoulder girdle: This is a common synonym for pectoral girdle, especially in human anatomy.
• Pectoral (adjective): Of or relating to the chest or breast. Example: .

Synonyms

• Shoulder girdle

Related Anatomical Terms (Not Synonyms)

• Scapula: The shoulder blade, a major bone of the pectoral girdle.
• Clavicle: The collarbone, the other major bone in the human pectoral girdle.
• Pelvic girdle: The skeletal structure to which the lower limbs are attached.
• Axial skeleton: The central skeleton (skull, vertebrae, ribcage) to which the pectoral girdle attaches.

Noun

1. a skeletal support to which the forelimbs of vertebrates are attached