Muscles of the Back

Overview

The muscles of the back support posture, control spinal movements and assist in upper limb function. This section introduces the layered organisation of the back musculature and explains the coordinated roles of the superficial, intermediate and deep groups.

Key Structures

Topics include the superficial muscles, which connect the upper limb to the trunk; the intermediate muscles, involved in respiratory movement; and the deep muscles, which stabilise and move the vertebral column. Each article outlines attachments, innervation and functional roles.

Clinical Relevance and Learning Focus

Back muscle anatomy is vital for assessing musculoskeletal pain, postural dysfunction and spinal movement disorders. Knowledge of these layers supports clinical reasoning, examination and rehabilitation planning.

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Illustration of the superficial muscles of the back, highlighting their anatomical positions.

The Superficial Back Muscles

The Intermediate Back Muscles

An anatomical illustration of the posterior thorax and lower back showing the erector spinae muscles, labeled spinalis, longissimus, and iliocostalis.

The Intrinsic Back Muscles

Popular

Lateral view diagram of the oral muscles of facial expression, highlighting the blending of buccinator and orbicularis oris fibers.
Encyclopaedia

Orbicularis Oris

by Max Bidewell

Illustration of the anterior thigh muscles, color-coded with a legend identifying psoas major, iliacus, rectus femoris, vastus medialis, vastus lateralis, sartorius, and pectineus.
Encyclopaedia

Vastus Lateralis

by Roxanne Salkeld

Illustration of the lateral head and neck showing the course and tributaries of the retromandibular vein, including the superficial temporal, maxillary, posterior auricular, facial, external jugular, and internal jugular veins.
Encyclopaedia

Retromandibular Vein

by Jared Tang