Podcast
Questions and Answers
Which nerve forms a loop from C1-C3 and innervates structures like geniohyoid and sternothyroid?
Which nerve forms a loop from C1-C3 and innervates structures like geniohyoid and sternothyroid?
What does the phrenic nerve primarily innervate?
What does the phrenic nerve primarily innervate?
Which muscles are innervated by the segmental branches of the cervical plexus (C1-C4)?
Which muscles are innervated by the segmental branches of the cervical plexus (C1-C4)?
Where does the phrenic nerve run in relation to the fibrous pericardium?
Where does the phrenic nerve run in relation to the fibrous pericardium?
Signup and view all the answers
Which nerve descends obliquely with the internal jugular vein across the anterior scalene?
Which nerve descends obliquely with the internal jugular vein across the anterior scalene?
Signup and view all the answers
What is the main function of the ansa cervicalis loop?
What is the main function of the ansa cervicalis loop?
Signup and view all the answers
What is the main function of the suboccipital nerve?
What is the main function of the suboccipital nerve?
Signup and view all the answers
Which nerve arises between the first and second cervical vertebrae to innervate the scalp, ear, and parotid glands?
Which nerve arises between the first and second cervical vertebrae to innervate the scalp, ear, and parotid glands?
Signup and view all the answers
Which segmental branches give rise to the greater occipital nerve?
Which segmental branches give rise to the greater occipital nerve?
Signup and view all the answers
What is the location where the suboccipital nerve exits the spinal cord?
What is the location where the suboccipital nerve exits the spinal cord?
Signup and view all the answers
Which of the following nerves innervates the suboccipital triangle muscles?
Which of the following nerves innervates the suboccipital triangle muscles?
Signup and view all the answers
What is the origin of the third occipital nerve?
What is the origin of the third occipital nerve?
Signup and view all the answers
What is the main cause of pain resulting from parotitis?
What is the main cause of pain resulting from parotitis?
Signup and view all the answers
Which nerve innervates the anterior region of the neck?
Which nerve innervates the anterior region of the neck?
Signup and view all the answers
Where does the transverse cervical nerve perforate the deep cervical fascia?
Where does the transverse cervical nerve perforate the deep cervical fascia?
Signup and view all the answers
Which nerve innervates the skin and scalp posterosuperior to the auricle?
Which nerve innervates the skin and scalp posterosuperior to the auricle?
Signup and view all the answers
What is the function of supraclavicular nerves in the neck region?
What is the function of supraclavicular nerves in the neck region?
Signup and view all the answers
Which nerves provide cutaneous innervation to the anterolateral parts of the neck?
Which nerves provide cutaneous innervation to the anterolateral parts of the neck?
Signup and view all the answers
Study Notes
Cervical Plexus
- Muscular branches of cervical plexus include:
- Ansa cervicalis (loop formed from C1-C3), innervating geniohyoid (C1 only), thyrohyoid (C1 only), sternothyroid, sternohyoid, and omohyoid
- Phrenic nerve (C3-C5, primarily C4), innervating diaphragm and pericardium
- Segmental branches (C1-C4), innervating anterior and middle scalenes
Phrenic Nerve
- Phrenic nerve descends obliquely with the internal jugular vein across the anterior scalene, deep to the prevertebral layer of deep cervical fascia and the transverse cervical and suprascapular arteries
- Runs anterior to the root of the lung and between the fibrous pericardium and mediastinal face of the parietal pleura
- Important for breathing, as it passes motor information to the diaphragm and receives sensory information from it
Cervical Nerves
- There are 8 cervical segments forming 8 pairs of cervical nerves in a human spinal cord
- Cervical nerves include:
- Posterior distribution: suboccipital nerve (C1), greater occipital nerve (C2), and third occipital nerve (C3)
- Suboccipital nerve (C1) supplies muscles of the suboccipital triangle
- Greater occipital nerve (C2) innervates the scalp at the top of the head, over the ear and over the parotid glands
- Third occipital nerve innervates the scalp posterosuperior to the auricle
Other Branches
- Transverse cervical nerve (C2,C3) innervates the anterior region of the neck
- Lesser occipital nerve (C2) innervates the skin and scalp posterosuperior to the auricle
- Supraclavicular nerves (C3,C4) arise from the third and fourth cervical nerves, and innervate the skin of the posterior triangle of the neck
Studying That Suits You
Use AI to generate personalized quizzes and flashcards to suit your learning preferences.
Description
Test your knowledge on the muscular branches of the cervical plexus including Ansa cervicalis, Phrenic nerve, and segmental branches innervating various neck muscles. Identify the innervation patterns and functions of these branches.
