Final answer:
Spastic upper limbs in a patient with cerebral palsy are characteristic of an upper motor neuron lesion, indicated by symptoms such as hyperflexia, decreased control of movement, and strong reflexes.
Step-by-step explanation:
The patient with cerebral palsy described as having spastic upper limbs is likely affected by an upper motor neuron (UMN) lesion. This conclusion is drawn from the presence of spasticity in the upper limbs, which is an excess contraction in resistance to stretch often resulting in hyperflexia where joints are overly flexed. The description of spastic limbs also indicates strong deep tendon reflexes, muscle weakness, and decreased control of movement. A key test for UMN lesions is to assess for pronator drift.
Another aspect to consider is the 'clasp-knife response', where a patient initially resists movement but then suddenly releases, causing the joint to rapidly flex. These signs contrast with lower motor neuron (LMN) damage, which typically leads to flaccidity or weakness without reflexes.