What is role strain in sociology? A: Role strain in sociology is when a particular role a person needs to fulfill is strained due to excessive obligations or multiple demands on time, energy or available resources.
Short posterior ciliary arteries: Branch from the ophthalmic artery and pierce the sclera at the edge of the optic nerve; they supply the choroid and the rods and cones of the retina. Long posterior ciliary arteries: Branch from the ophthalmic artery and pierce the sclera to supply the ciliary body and iris.
And our third bit of knowledge is the mnemonic, '2 from 1, 2 from 2, 2 from 3'. We know our first two nerves are the iliohypogastric and ilioinguinal nerves and we know that two nerves come from one root, so these are the first two nerves, so they come from the 1st root of the lumbar plexus, so L1.