Muscle Groups

Description

Shown in lateral profile, the adult female head, neck, thorax, and proximal upper limb are rendered with semi-transparent skin to expose superficial and intermediate muscle layers alongside the rib cage. Temporalis fans superiorly from the temporal fossa to the coronoid process, while masseter sits posterolateral to the oral commissure, spanning from the zygomatic arch to the mandibular angle. Inferiorly, the sternocleidomastoid runs obliquely from the mastoid process to the manubrium and medial clavicle, lying anterior to the upper trapezius and framing the lateral neck as it approaches the shoulder girdle. Across the thorax and arm, pectoralis major sweeps from sternum and clavicle toward the proximal humerus, the deltoid caps the glenohumeral joint laterally, and biceps brachii occupies the anterior compartment of the upper arm, while intercostal muscle slips track between adjacent ribs. For teaching, this angle clarifies how jaw elevators (temporalis and masseter) align with mandibular mechanics, a frequent point of confusion when discussing bruxism, temporomandibular disorder, and the distribution of pain to the temporal region. The neck and shoulder grouping is equally practical: accessory nerve injury after posterior triangle lymph node biopsy classically leaves trapezius weakness with scapular droop, and the sternocleidomastoid becomes an easy surface landmark when mapping neck masses or planning an anterolateral approach. Respiratory mechanics read cleanly here, with rib contours and intercostals reinforcing the bucket-handle concept. Use it for undergraduate myology and surface anatomy labs, dental and maxillofacial teaching materials on muscles of mastication, and clinical education content covering shoulder girdle weakness patterns and intercostal strain. It also suits medical publishing layouts needing a female-presenting reference figure with clear muscle fiber directionality and bony landmarks for labeling. Anatomical accuracy verified by SciePro's Medical Advisory Board.