Procedure Gmuscles Of The Shoulder And Back

1. Place the fetal pig in the dissecting tray onto its lateral surface.

2. Remove any remaining fat and connective tissue to expose the muscles of the shoulder and back.

3. Study figure 24.6, and then locate and dissect the following superficial muscles:

brachiocephalic acromiotrapezius spinotrapezius deltoid latissimus dorsi

4. Using scissors, transect the latissimus dorsi and the group of trapezius muscles. Lift aside their cut edges and remove any underlying fat and connective tissue. Study figure 24.7, and then locate and dissect the following deep muscles of the shoulder and back:

supraspinatus infraspinatus teres major rhomboideus rhomboideus capitis splenius

Figure24.7 Deep muscles of the shoulder and arm, lateral view.

Figure24.7 Deep muscles of the shoulder and arm, lateral view.

Shoulder Anatomy Deltoid Insertion

Table 24.4 Muscles of the Shoulder and Back

Muscle

Origin

Insertion

Action

Acromiotrapezius Spinotrapezius

Brachiocephalic (clavotrapezius and clavobrachialis) Deltoid

Latissimus dorsi Supraspinatus Infraspinatus Teres major Rhomboideus

Rhomboideus capitis Splenius

Spines of cervical and thoracic vertebrae Spines of thoracic vertebrae Occipital bone and mastoid process Spine of scapula Thoracic and lumbar vertebrae Fossa above spine of scapula Fossa below spine of scapula Posterior border of scapula Spines of cervical and thoracic vertebrae Occipital bone Fascia of neck

Spine and acromion process of scapula Spine of scapula Distal end of humerus

Proximal end of humerus Proximal end of humerus Proximal end of humerus Proximal end of humerus Proximal end of humerus Medial border of scapula

Medial border of scapula Occipital bone

Pulls scapula upward

Pulls scapula upward and back Flexes forelimb

Flexes forelimb

Pulls forelimb upward and back Extends forelimb Rotates and abducts forelimb Extends and adducts forelimb Pulls scapula upward and forward Pulls scapula forward Raises head

5. See table 24.4 for the origins, insertions, and actions of these muscles in the shoulder and back.

6. Complete Part C of the laboratory report.

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Responses

  • alice
    Where are lymph nodes in fetal pig?
    2 years ago

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