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serratus muscle
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Diagram of a lizard showing labeled trunk muscles, including longissimus cervicocapitis, longissimus dorsi, spinalis capitis, iliocostalis, transversospinalis, rectus capitis, costocervicalis, serratus ventralis, and external intercostals. An anatomical illustration of the human upper limb and chest from the front, showing labeled muscles such as the deltoid, pectoralis major, biceps, triceps, and serratus anterior, along with the cephalic vein and thoracoacromial artery. Illustration of the human muscular system from a side view, showing detailed muscles throughout the body with labels identifying major muscles in the head, torso, arms, and legs. Anatomical illustration of a cat in side view with its trunk and limb muscles exposed and labeled, showing major muscle groups such as trapezius, latissimus dorsi, gluteus, and biceps femoris. An anatomical illustration of the human torso highlighting the muscles of the abdominal wall, with labeled structures including the deltoid, pectoralis major, serratus anterior, latissimus dorsi, external and internal oblique, rectus abdominis, and associated connective tissues. Illustration of the human back showing labeled muscles including trapezius, deltoid, latissimus dorsi, erector spinae, rhomboids, and gluteus maximus, with detailed anatomical structure.
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serratus muscle

anatomy
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Diagram of a lizard showing labeled trunk muscles, including longissimus cervicocapitis, longissimus dorsi, spinalis capitis, iliocostalis, transversospinalis, rectus capitis, costocervicalis, serratus ventralis, and external intercostals.
trunk musculature: lizard Axial view of the trunk muscles of a lizard.

The serratus muscle is a group of muscles that attach the scapula (shoulder blade) to the ribs. In typical tetrapods, two major derivatives of the external oblique muscle attach the scapula to the body: the serratus and the levator scapulae. The serratus is made up of numerous finger-like slips that run from the scapula to the neighboring ribs.1

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2 Britannica Sources
  1. pectoralis muscle
  2. muscle - Tetrapod musculature

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