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C-4 neural arch, C-5 spinal ganglion, acromion, caudal parathyroid gland (pouch 3), cephalic vein, clavicle, common carotid artery, deltoid muscle, dorsal funiculus, dorsal horn, edge of chin, esophageal muscularis, head of humerus, internal jugular vein, jugular lymph sac, lateral funiculus, longus muscles, manubrium of sternum, middle sympathetic ganglion, pectoralis major muscle, platysma, recurrent laryngeal nerve, scalene muscles, semispinalis capitis muscle, semispinalis cervicis and multifidus muscles, splenius muscle, sternoclavicular joint, sternohyoid muscle, thyroid isthmus, tip of cartilage of pharyngeal arch 1, tracheal cartilage, trapezius muscle, vagus nerve (CN X), ventral funiculus, ventral horn

A section through the edge of the chin, manubrium of the sternum and C-5 spinal ganglion.

Observe:
1. The tips of the first arch cartilage in the edge of the chin.
2. The clavicle connecting the acromion of the scapula with the manubrium of the sternum.
3. The head of the humerus surrounded by the deltoid muscle.
4. The isthmus of the thyroid gland ventral to the trachea and the caudal parathyroid gland (pouch 3) lateral to the trachea.
5. The recurrent laryngeal nerve (motor to the laryngeal muscles) in the groove between the trachea and esophagus.


Keywords: C-4 neural arch, C-5 spinal ganglion, acromion, caudal parathyroid gland (pouch 3), cephalic vein, clavicle, common carotid artery, deltoid muscle, dorsal funiculus, dorsal horn, edge of chin, esophageal muscularis, head of humerus, internal jugular vein, jugular lymph sac, lateral funiculus, longus muscles, manubrium of sternum, middle sympathetic ganglion, pectoralis major muscle, platysma, recurrent laryngeal nerve, scalene muscles, semispinalis capitis muscle, semispinalis cervicis and multifidus muscles, splenius muscle, sternoclavicular joint, sternohyoid muscle, thyroid isthmus, tip of cartilage of pharyngeal arch 1, tracheal cartilage, trapezius muscle, vagus nerve (CN X), ventral funiculus, ventral horn

Source: Atlas of Human Embryos.