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Within the suboccipital triangle, identify the vertebral artery and the posterior (dorsal) primary ramus of the first cervical [C1] spinal nerve
. Also identify the occipital artery, greater occipital nerve (the posterior primary ramus of the second cervical [C2] spinal nerve), lesser occipital nerve (the anterior primary ramus of the second cervical [C2] spinal nerve), and posterior (dorsal) primary ramus of the third cervical [C3] spinal nerve.
Links and References:
Grant's: 4.51, 4.52, 4.53, 4.57 and 4.58
Netter: 162
Rohen/Yokochi: 210, 211, 215, 222, and 223