Overview Origin Insertion Function Innervation Labored Breathing In labored breathing, extrinsic back muscles stabilize and retract the scapula. This allows the deep extrinsic chest muscles to expand the rib cage and increase breathing capacity. Extrinsic back muscles are typically less variant than other muscles. However, the levator scapula muscle has a high percentage of variability. […]
Overview Trapezius anatomy is complex. Basically, the trapezius is a broad, flat muscle covering the upper back. It is named for the trapezoid shape that these paired muscles create. It has three major sections that originate on the axial skeleton and insert on the pectoral girdle, making it an extrinsic back muscle. Each section has
The anatomy of the latissimus dorsi seems simple but ends up attaching to more bones in the back than almost any other muscle. It connects the mid-back, low-back, and pelvis to the humerus through the thoracic vertebrae, clavicle, and scapula. The latissimus dorsi is a broad, flat muscle covering the mid-back. The name comes from
Rhomboid Muscles The anatomy of the rhomboid major and minor seems straightforward. These muscles attach the upper thoracic and lower cervical vertebrae to the scapula. Consequently, these muscles trap the ribs, sternum, and clavicle between their attachments. Rhomboid Minor Origin Insertion Function Rhomboid Major: Origin Insertion Function The rhomboid major and minor are usually thought of
Rhomboid Major and Minor Muscles – Functional Anatomy Read More »
Overview The Levator scapula is a ropy extrinsic back muscle that connects the scapula to the upper cervical vertebrae. Its function and variations are more involved than most muscles. Origin Insertion Function Nerve As the name implies, it elevates the scapula. This action assists in the downward rotation of the scapula. Anchoring the upper extremity
