Final answer:
The area of the breast tissue extending toward the axilla is called the tail of Spence. In relation to the skeletal structure, the pectoral girdle, comprised of the clavicle and scapula, facilitates attachment of the upper limbs, with the scapula's acromion process forming the bony tip of the shoulder.
Step-by-step explanation:
The portion of the breast that extends superiorly and laterally towards the axilla is known as the tail of Spence. This area contains glandular tissue and extends into the axillary (armpit) region. It is considered an extension of the tissue of the mammary glands, vital for the production of milk.
The pectoral girdle, consisting of the clavicle and the scapula, serves as a point of attachment for the upper limbs to the axial skeleton. The scapula, or shoulder blade, features several landmarks such as the coracoid process, the acromion, and the glenoid cavity which are important for muscle attachments and formation of joints. The acromion specifically is a key part of the scapula as it extends laterally to form the bony tip of the shoulder.