Which of the muscles visible in this figure would you label as an extrinsic back muscle?

5. Which of the muscles visible • in this figure • would you label as an • extrinsic back muscle?

6. Back Muscles

7. Back Muscles Extrinsics (for limb movements and respiration) Intrinsics Superficial (limb mvmts) Intermediate (respiration) Deep (mvmt of head and vertebrae) Trapezei Levator scapulae Rhomboids Latissimus dorsi Serratus posterior superior and inferior (layers) Superficial Intermediate (Erector Spinae – chief extensors – in three columns) Deep (Layers) (lateral) (medial) Splenius (bandage-like) Iliocostalis Longissimus Spinalis Cervicis Thoracis Lumborum Capitus Cervicis Thoracis Capitus Cervicis Thoracis (transversospinal muscles) Capitus Cervicis Semispinalis Multifidus Rotatores Interspinalis intertransversarii Levator costarum Capitus Cervicis Thoracis

8. Levator scapulae Trapezei muscles Rhomboid muscles Serratus posterior superior Latissimus dorsi Serratus posterior inferior

9. Which of the labeled muscles in this figure (#1 or #2) is the medial pterygoid muscle and which is the lateral pterygoid muscle? 1 2

10. Which of the labeled muscles in this figure (#1 or #2) is the medial pterygoid muscle and which is the lateral pterygoid muscle? Lateral pterygoid m. Medial pterygoid m. Buccinator m. Posterior belly of the digastric m. Masseter m.

11. Identify the labeled muscles in this figure. 1. 2. 3. 4. 5. 1 2 3 4 5

12. Identify the labeled muscles in this figure. 1. Left sternocleidomastoid muscle 2. Right splenius capitis muscle 3. Left upper trapezius muscle 4. Left rhomboid major muscle 5. Left latissimus dorsi muscle 1 2 3 4 5

13. What is the function of this muscle? 1

14. What is the function of this muscle? This is the serratus posterior superior muscle. It assists during forced inspiration as it elevates the superior four ribs, increasing the diameter of the thorax and raising the sternum. 1

15. What are the borders of the anterior and posterior cervical triangles? Anterior: Posterior:

16. What are the borders of the anterior and posterior cervical triangles? Anterior: Anterior median line of the neck Inferior border of the mandible Anterior border of the sternocleidomastoid muscle Posterior: Posterior border of the sternocleidomastoid m. Anterior border of the trapezius m. Middle third of the clavicle

17. What nerve is responsible for the innervation of these muscles of facial expression?

18. What nerve is responsible for the innervation of these muscles of facial expression? CN VII (the facial nerve) supplies the muscles of facial expression. Recall that this nerve entered the internal acoustic meatus and then travels through the petrous portion of the temporal bone before exiting the skull through the stylomastoid foramen. At the level of the parotid gland it separates into five terminal motor branches.

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20. Frontalis, or frontal belly of epicranius m. Temporalis m. Orbicularis oculi m. Levator labii superioris m. Zygomaticus minor m. Zygomaticus major m. Orbicularis oris m. Buccinator m. Mentalis m. Masseter m. Risorius m. Depressor labii inferioris m. Depressor anguli oris m. Sternocleidomastoid m.