Thoracic Spinal Nerves Flashcards
How many pairs of thoracic spinal nerves?
12 pairs
Each mixed thoracic nerve will divide into what?
Posterior and anterior primary ramus
The posterior primary ramus projects where and divides into what?
posteriorward
Medial and lateral branch
The medial branches of the posterior primary ramus have what type of function?
Motor AND sensory
What are the muscles supplies by the medial branches of the posterior primary rami?
semispinalis
longissimus
multifidi
The medial branches of the posterior primary rami provide sensory to what?
Skin paraspinally
The lateral branches of the posterior primary rami increase in size from ______ to ______. Why?
Superior to inferior
Because area of skin increases as ribs get longer
What type of information is carried in the lateral branches of the posterior primary rami?
Motor AND sensory
What muscles are supplied by the lateral branches of the posterior primary rami?
longissimus
iliocostalis
Lavatory costarum
The sensory area supplied by the lateral branches of the posterior primary rami is?
Skin near the costal angles
The anterior primary ramus of T1 will contribute to what plexus?
Brachial plexus
A smaller branch of anterior primary ramus of T1 will form what nerve?
First intercostal nerve
The anterior primary rami of T2 and T1` (sometimes) contribute to what nerve?
Intercostobrachial nerve (from medial cutaneous nerve of arm)
Are the contributions of T1 and T2 instead of the intercostal nerves?
NO they are contributions to the intercostal nerves
Each intercostal nerve gives off what?
A lateral cutaneous branch
The lateral cutaneous branch of the intercostal nerves divides into what?
Anterior branch and posterior branch
These branches of the intercostal nerves supply what?
Overlying skin
Intercostal nerves terminate as What?
Anterior cutaneous branches
The anterior cutaneous branches of intercostal nerves supply what?
Skin close to midline
The intercostal nerves give off a number of muscular branches along the course of their adjacent ribs supplying what rib muscles?
Internal intercostal External intercostal Innermost intercostal Serratus posterior transversus thoracis
The intercostal nerves give of a number of muscular branches along the course of their adjacent ribs supplying what abdominal muscles?
Transverse abdomens
Internal & external abdominal oblique
Rectus abdominus
The intercostal nerves will also supply what ?
Blood vessels, bones, joints, and ligaments
What is the largest thoracic nerve?
The subcostal nerve
The subcostal nerve also contributes to what plexus?
Lumbar plexus
