Neck 1: Superficial Structures of the Prevertebral and Lateral Cervical Regions Flashcards
Which nerve is derived from the first pharyngeal (branchial) arch?
Trigeminal nerve
What muscles are derived from the first pharyngeal (branchial) arch?
- muscles of mastication
- mylohyoid and anterior belly of digastric
- tensor tympanic
- tensor veli palatini
What skeletal structures are derived from the first pharyngeal (branchial) arch?
- malleus
- incus
What ligaments are derived from the first pharyngeal (branchial) arch?
- anterior ligament of malleus
- sphenomandibular ligament
What nerve is derived from the second pharyngeal (branchial) arch?
Facial nerve
What muscles are derived from the second pharyngeal (branchial) arch?
- muscles of facial expression
- stepdius
- stylohyoid
- posterior belly of digastric
What skeletal structures are derived from the second pharyngeal (branchial) arch?
- stapes
- styloid process
- lesser cornu of hyoid
- upper part of body of hyoid bone
What ligaments are derived from the second pharyngeal (branchial) arch?
stylohyoid ligament
What nerve is derived from the third pharyngeal (branchial) arch?
Glossopharyngeal nerve
What muscle is derived from the third pharyngeal (branchial) arch?
stylopahryngeus
What skeletal structures are derived from the third pharyngeal (branchial) arch?
- greater cornu of hyoid
- lower part of body of hyoid bone
What nerves are derived from the fourth and sixth pharyngeal (branchial) arches?
- superior laryngeal branch of vagus (CN X)
- recurrent laryngeal branch of vagus (CN X)
What muscles are derived from the fourth and sixth pharyngeal (branchial) arches?
- cricothyroid
- levator veli palatini
- constrictors of pharynx
- intrinsic muscles of larynx
- striated muscles of esophagus
What skeletal structures are derived from the fourth and sixth pharyngeal (branchial) arches?
- thyroid cartilage
- cricoid cartilage
- arytenoid cartilage
- corniculate cartilage
- cuneiform cartilage
What are the 4 main regions of the superficial neck?
- Sternocleidomastoid
- Posterior cervical region
- Lateral cervical/Posterior triangle
- Anterior cervical/Anterior triangle
What makes up all of the boundaries of the superficial neck?
muscles and the midline
What is the platysma muscle innervated by?
Cervical branch off of the Facial nerve (CN VII).
What is the sternocleidomastoid muscle innervated by?
Spinal accessory nerve (CN XI).
What are the functions of the sternocleidomastoid muscle?
- lateral flexion with rotation
- extension at atlanto-occipital joints
- flexion of cervical vertebrae (person is supine)
What are the two primary types of Toticollis?
(1) Fibromatosis colli - (fibrous tissue accumulates in the muscle; most common in neonates).
(2) Muscular toticollis - (“Wry neck”; can be congenital - infants; birth trauma - infants; muscular or nerve injury).
What are the 5 compartments of the neck?
- superficial fascia
- investing layer
- pretracheal layer
- prevertebral layer
- alar fascia and carotid sheath
Between what layers of the superficial neck does the hyoid muscles sit between?
Pre-tracheal layer and Investing layer.
What gland and structures are found within the pretracheal layer?
- esophagus
- trachea
- thyroid gland
What muscle of the superficial neck is surrounded by the investing layer?
Sternocleidomastoid (SCM) m.
trapezius is also surrounded by the investing layer
What structures are found in the alar fascia and carotid sheath of the superficial neck?
- common carotid layer
- vagus nerve
- internal jugular vein
- lymph
Between which two fasical layers of the neck is the retropharyngeal space located?
- prevertebral layer (posterior)
- alar fascia (anterior)
Other than the trapezius muscle, which is encased in the investing layer, what fascial layer surrounds the deep, posterior neck muscles?
prevertebral layer
Make sure to label the superficial veins of the neck.
slide 24 in the lecture notes
In a superficial dissection of the neck, what nerves and muscles are found deep to the investing fascia?
- Accessory n. (CN XI)
- Dorsal Scapular n.
- Nerve to Levator Scapulae
- Roots of Brachial Plexus
- Phrenic n.
- Scalene muscles
- Splenius capitis